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The Day 1 was a Ridgeback bike, and then Madison took the Genesis name and set them up as a standalone company back in about '07, I think. But essentially, as 606 says, they're just Ridgebacks.
They used to be ok-ish, but the later bikes are just horrible; well-specced in most cases but the frames are awful. Supposedly Reynolds steel, but they're the most unresponsive, heavy, inert things you can get. They never fail to amaze me how badly they handle and just how dead they feel. There's no life, no spring in them at all. I've no idea how they manage to make them like that.
^ Good post.
Mosquito were great, back in the day, but then went wanky.
They're just fucking Ridgebacks, and they were always shit.