The definition of own is open to interpretation.. according to the EULA.

I tried the Gametap service after becoming interested in all the free games you could play. However, most of the ones I was interested in are rated M, and therefore I had to sign up. Unfortunately, being in Australia, i couldn't do this so i was therefore stuck playing freebie games I wasn't interested in or cared about at all.
So, good if from North America, pretty hopeless from any other part of the world. I uninstalled it quick smart.
Also, the gametap player thing annoyed me, entirely too convoluted for its own good. It tries to be modern and snazzy and just comes off as cheap. Much better is the clean simplistic approach gog.com adopts, being web-based and all.

I'd recommend taking the plunge into it. GameTap has some damn fine games, and they're even merging with a company that offers a similar product, but with more modern games, so it should get even better.
EDIT:
Just looked up the deal, and they're merging with Metaboli. Metaboli has bunches of Ubisoft (Assassin's Creed) and Eidos (Hitman Series) games, as well as some other publishers.

Nah. I'm not going to pay a monthly fee to "rent" games. Plus it doesn't work with 64bit operating systems.
I will take a service like GoG, where you buy want you want, and it is yours to keep forever. Plus the games work on 64bit XP too.

Oh, I can understand that and how it can be useful to some people. For myself though, I like to go back and replay games in my collection from time to time, and I really don't need another monthly fee. For someone that likes to rent alot of games, it would be a good service to have I am sure.
It would have to be one huge collection of games for me to really consider using a service like gametap. Not really worth it when there is only a handful of games they have I would want to play, and it would be cheaper to just buy the ones I am interested in and be able to keep them. I am just one of those freaks that likes building up his game collection. I'm weird like that!

I stopped subscribing to Gametap once they downsized their inventory and took out the Ultima games. :(

I, personally was a GameTap member. But, I stopped subscribing when they dropped Myst Online: Uru Live, basically. 'Twas the only reason I signed up, to be honest.
I personally wouldn't recommend them in the slightest.

The only thing about Gametap that really tempts me is their collection of RPGs. I really want to get my hands on Baldur's Gate and Planescape Torment, but I hated going through the stupid player for Fallout, which means I'll just wait for the (hopefully) inevitable expansion of GOG's RPG catalogue.

Between gametap and gog I'll take gog anytime. I rather own the game I buy than rent it in a system like gametap. How do i know that gametap, or any other site/system (ex:valve/steam) won't someday close/end support and we are left with nothing.
At least with gog we can keep what we pay, we can actually own it. And we can actually replay it, who knows, 10, 15 years from now.

I don't play often games often enough for a monthly fee to make sense. I'd rather buy a game I could play anytime in the future, rather than fork out for a service I'd hardly touch.
Between GoG and Steam I think I've got online buying covered. :)

I used to subscribe to GT, and I thnk it was a great service. But when they rehauled their program a while ago, it no longer works for me. It crashes my router. Totally. I have to walk downstairs and reset the modem anytime I started GT. Tech support was very unhelpful.
So, no more money from me.

Gametap emulation wasn't very accurate. It skipped frames a lot. The PC stuff seemed ok, minus adding quite a bit of overhead for the gametap system, and long load times.
Yep, both pretty decent options. I like Steam's 50%-75% off sales.

The new version of Gametap is rubbish. For no adequately explained reason they have dumped the Player and now rely on a browser plugin. The site is now referred to as a "beta", but customers still pay full price for it (in fact the fees have increased up as part of this change).

Yeah, I tried it for a while, and then suddenly it stopped working for me. I eventually found the problem. It doesn't work if you have COMODO Firewall installed. Note, not just running, if its installed at all, Gametap will not launch PC Games, they just give an "internal error" message. The only advice Gametap's support could give me was to uninstall COMODO, which isn't happening. I should note that this was prior to this new website thing, so maybe they've moved to COMODO compatible DRM.