I have a FLM Centerball 58FT. It's this one: http://www.fotomayr.de/webkat98/home...tml/001906.HTM
It has an adjustable friction as well as a tilt lock. If locked with the camera adjusted horizontally you then can only tilt the camera. This way you get the best of both worlds. The 58 in the name refers to the diameter of the ball. So it's pretty heavy.
I've been wondering about this head as a more compact alternative to my B2 for when I don't need quite so much support, and you're the first person I've encountered who actually owns one. What camera(s) are you using with it, and does it do what it's supposed to do?