GoG is great but they aren't competitive enough in pricing with steam/amazon/gmg. I consider them superior to those 3 if the prices are equal but they are never equal so I basically never buy from GoG aside from games that aren't available anywhere else.
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I only like them when I feel nostalgic about playing an old game that's nowhere to be found but GoG. Other than that, I've encountered quite a few problems with some of their "DRM-free" games that were in fact "cracked", and wouldn't work properly for one reason or another. Therefore, given the opportunity, I'd rather deal with Steam, Origin, or Uplay DRM as I've yet to encounter any issues with those.
I never used GoG. I wish I could though, seeing as they have many games I want (the classics, specially), and their DRM policies REALLY interest me.
But they still don't accept Brazilian credit cards, something that prevents me buying from them...
It'd be interesting to know why that is. In my line of work Brazilians are well respected, highly sought-after clients, and I wish I had more of them.