The Bogen plates didn't impress me one bit. Completely wobbly, completely overpriced.
Luckily, I got to play with
one of these yesterday, and it's "the one" after searching for a long time. The Tracker 1 is also available if you're shorter than I (no offense intended, I'm 6'3" and I only need to extend the center column by like 2").
Look closely at the larger picture. See the little screw head on the "back" of the QR area? That squeezes the plate down and holds it down. There is a little trigger on the right side, easily accessible while grasping the camera with the left hand. The plate actually slides out to the right, so it sits in a groove instead of just floating like the Bogen.
Just my findings
Oh, and the movements are very very smooth...