The thing doesn't roll that well in my opinion so I never bought one. As a general rule I try to stay away from NYKO anyway, but this one seemed interesting.
I was seriously looking into it maybe even for a hack, but from everything I've understood the Playstation reads it as the PS mouse. In other words, compatibility is VERY limited. If I remember right, I read that the Atari collection does include mouse support, but still near useless.