My desktop and previous 2 laptops all used AMD/ATI. My current laptop uses Nvidia and frankly, it has been a lot less hassle to use their blob.
It seems that the majority of people who post on these forums are enthusiasts, and the majority of enthusiasts are gamers. I just wanted to point out that there's a large population of users who don't use OpenGL (don't even know or care what it is), all they need is for their computer to let them run office apps, surf the web, and watch videos.
On this score, AMD still has a lot of catching up to do on the Linux front. This absence of support is going to keep more users on either Nvidia or Windows, neither of which is a good thing as far as open source advancement goes. fglrx/XvBA is also a joke, it hardly supports any video cards, so even AMD/closed source is not viable on Linux.
For the vast majority of computer users, ATI+Linux has zero value today. That bums me out quite a lot, I would prefer to be using all AMD/ATI. But on the hardware side (laptops) the products aren't there, and on the software side, the support isn't there.