Hello everyone.
I don't mean to ask a stupid question here, but I'm thinking about buying a new computer, and I've been contemplating trying a mac for once.
I know Steam has offerings for Mac. What is the level of compatibility with my GoG games, if at all.
Also, for games that will work on Mac, do they work well (if anyone has any personal experiences to share)?
Thanks for any help/advice.

What the hell is a Mac?

All the DOS games should work, since DOSBox is available for Mac. No idea how you would get the game out of the Windows installer that they provide here, other than to install the game on a Windows PC and then copy the files to your Mac. You would then have to setup the DOS game to run with the Mac version of DOSBox.
The Windows titles won't work unless you do something like install Windows on your Mac, and switch between the two operating systems when you want to run the Windows application.
It would be nice if GOG provided friendly installers for Linux and Mac.

Do the world a favor and stick with Windows, okay? :p

Why would you want to pay more for a PC just because it has a less useful* OS installed on it? Even if you just want Mac OS for its shininess, that doesn't even make sense given that we now have Windows 7.
*Especially when it comes to gaming.
It's an overpriced PC with Mac OS installed on it.

Quite true about the overpricing. With what you buy a decent mac you can buy an even better pc for less. Also buying a mac for gaming is a bad idea. You will just end up double booting it.

Oy. Well, we made two or three posts before people had to share how much they hate mac.
Officially: GoG has no Mac support. At all. There have been hints that it is coming, but so far they are only hints.
Unofficially, any game that uses DOSBox is a simple matter of swapping out for the mac version of DOSBox (and grabbing the files out of the installer). Same thing for any of the SCUMM games.
Although, pretty much anything that uses DirectX is going to be a bitch and a half.
This thread goes into much more detail, and is probably correct. I am just pulling this out of my arse.
http://www.gog.com/en/forum/general/gog_games_on_mac_os_x_a_how_to
That being said, if your primary desire is gaming (probably not, if you are thinking about changing to a mac), then stick to Windows. Otherwise, feel free to enjoy Linux and/or mac, just don't complain when you have to jump through a few hurdles :p

This information could be wrong, as I only use a Mac at work and not for gaming at all:
If you don't mind getting a copy of Windows, you should be able to run games for Windows by dual-booting using the Mac software boot camp.

Macs are great for Mac software but not so good at running Windows games. You might want to look into "Crossover Games". It's a compatability environment for Windows games on the Mac platorm.
http://www.codeweavers.com/products/cxgames/
I have no experience with Crossover, but if its anything like Wine, it will be a bit fiddly and twitchy. Flaws aside, I find Wine invaluable on my Linux box.

1) If you use Boot Camp: 100% compatibility, but it means rebooting to a less useful OS*.
*except for gaming
2) DOSBox Games: as far as I know, 100% compatibility.
3) Native ports: Freespace, Freespace 2, Descent 1 & 2, Riven, probably others. The Steam versions of Portal and The Dig run fine for me. Apparently Portal is slower than the Windows version but I enjoyed it anyway.
4) Emulation via VM: Faster than you'd think, but not perfect in it's implementation. GOG games should *mostly* work. YMMV
5) Emulation via WINE/Crossover - the least pleasant option, in my experience. You can however use this to run UniExtract and get the data files out of the GOG installers though.
The reasons to get a Mac
- SIGNIFICANTLY LESS messing with the system. Just use the darn computer, already.
- The OS *workflow and consistency* kills most everything else, (including Win7, which is an awesome OS)
- You don't mind paying a bit extra to get quality peripherals (cheap ones are basically ignored by the OS).
- OS-specific apps. (anyone know a Windows version of DEVONThink Pro or Yep?)
- Best of both worlds. You can run Windows AND Mac stuff on the same box (even at the same time).
The reasons not to get a Mac
- You're going to be doing only Windows stuff anyway
- You love tweaking the extra 5% of speed by installing video drivers every month or so.
- You gotta have the bargain bin printers, scanners and webcams.
- OS-specific apps. (OneNote, where are you? It wouldn't hurt to have another couple of OCR options too)
- The first thing that comes to mind when you list your computer uses is "gaming"
Don't listen to the haters (or the fans for that matter) when they spout their rhetoric. Don't ask "can it run x or y?", ask "how do you do x or y?". I have 30 years of computer experience under my belt, with loads of DOS Windows & Linux time spent. They all have their strengths but for my money, Mac on the desktop is the only option.

Crossover is essentially the Commercial side of Wine. They do a LOT of work for wine, have a large number of supported apps and games, and they tend to deal with a good amount of the fiddly bits getting games to work. Some games will still require some fiddling but often you can get support from Codeweavers for help. Well worth the price IMO, and you can usually find a deal on Crossover. I just got 2 years for the price of one.

You can search the Crossover database and often people will list if they have gotten GoG versions of a game to work.

With the new foray into modern games, I would like to see GoG have a renewed effort to provide Macintosh Support. It's too bad they don't make a deal with Transgaming to wrap up some of these games. I've never personally had a problem with any of my Cider based games. Sure I'd prefer a "native" game but if it gets more games on my platform of choice with a negligible performance impact it doesn't bother me in the slightest.

Are Windows users so uncomfortable with their platform of choice they have to lash out at every chance? There was a time we had our choice of a multitude of computer platforms and people loved it (well the nerds of the 80s loved it anyway). Does anyone really want to live in a computing world with less competition than the little we already have? Is that the world Windows users envision?

It's worth pointing out that Codeweavers hosts, maintains and supports the Wine Application Database, which is an invaluable resource for people getting Windows apps in general to run on Linux and Mac systems.

A lot of indie titles have Mac versions, especially ones that are rumoured to be joining the GOG catalog soon. Legends of Grimrock is supposed to be cross-platform on day one (including I think the iOS version), Trine has Mac version, as does Machinarium and Darwinia.

As for the classic games...I still don't see it. The only way I could see it happen is if GOG had a selected list of games that are absolutely, positively confirmed to work with zero configuration in a vanilla WINE environment (Heroes of Might and Magic 3 and Heroes Chronicles come to mind here) - they could then ship it in a Wineskin wrapper as a standalone Mac app.

The only problem with this is that I don't think that CDProject/GOG's contracts with their publishers covers cross-platform releases, let alone cross-platform releases using third-party compatibility environments (though on second thought this may just be covered under the terms allowing them to release games on DOSBox).

The most I'd ever expect to see out of them would be to have a little note saying that this game works on WINE version x, or have links to people who've posted it to GOGmixes tracking WINE/OS X/Linux compatibility.

Honestly? Just drop it man. It's not worth it. It's just not worth it. People have their own opinions and their own choices of platforms. Windows users aren't jackbooted Nazis out to conquer the world for Microsoft, clueless drones who don't know any better, or tasteless plebes with no sense of "good design" (whatever that means these days). They're just people who come here to enjoy great games, and lash out at something we all hate: DRM, and gaming companies who don't respect their customers.

I hate platform pissing matches. And I don't care what platform you're defending - it's an utterly stupid thing to fight over. I wish I could downvote/bury the comment I'm replying to, because it'd only draw the platform trolls out of the woodwork.