I have the bowflex in my house. I don't lift weight much but it is pretty good. There is a ton of exercises and a lot of them are actually useful. There's a bunch of addons too. There's a leg extension/leg curl one, pull-down tower, and a squat one. It is quite a bit of money though. I think my dad paid $1500 (with shipping) for the bow flex, pull-down tower, and leg thing.
I have found that the weight it says isn't the same. For instance, 100lbs on the bow flex seemed to be about 80lbs with a regular bar and weights.
I think it's good overall.