I joined this forum specifically for this thread... I had a Belkin NTe52, two Razer version and a Tartarus and now I'm on my third Logitech G13.
I don't want to go back to Razer, their build quality has greatly deteriorated in the last few years and their software just sucks.
I do like the G13, but no mechanical keys, and to be honest, pretty naff switches even for membrane ones. This is the third one, as I said, and all had the same issues - keys just stop working after a while.
I've been looking for alternatives, but the only options seem to be Razer of awful things from companies I've never heard of that look terrible.
I use the gamepad not just for gaming. I have it set for my photo editing software as well.. makes life so much easier. I can't imagine working without one now.
I'll be honest, the only bit of Corsair kit I have is the CPU cooler in my PC.