yea, i'm a fan.
i use them on 2 bikes now, training and racing. I got used to them very quickly. they're light as hell, and for $200 i have 4 mounts and TEN bottles. compare that to the price of one campagnolo carbon cage.
i've only dropped a bottle once on a horribly rough road in the ghetto. i've ridden on cobblestones Roubaix-style and they have stayed secure.