Myxia: To me the goodies aren't a negative, but they're often not a big deal. People should concentrate on the games themselves, I think. I've seen a lot of posts from people who get wowed by a few extra things, when they're not as important as the games themselves, and easily derived from them with a little snooping once the software is installed.
As far as the service, I'm not familiar with Impulse. If people feel their service is superior, then the choice should be pretty clear. I don't know anyone personally who uses Impulse; I was tempted to try it out when I thought GOG was disappearing, coincidentally. You try it yet?
I'm using both GoG, Impulse and even Steam. Each one of them has good and bad point, some of them could really improve (steam the most, the other need only a greater catalogue and a better infrastructure behind).
I usually use GoG when I think the game fits with its ideal, I use Impulse because it's a good alternative and less invasive than steam. I also use steam for discounted games.
Gog in its tiny reality was a good services. Being drm-free was indeed what made it famous and appreciated. But this alone could not be the main reason to purchase from them, other services try to do what they can. If they got a game first with good condition, it must be take in consideration. And in consideration must be taken the service owner behaviour and this time GoG really acted against itself with the pr stunt.