To tell you the truth, you may laugh but I just sold a BH55 (which I picked up new for $260) and am going to the Manfrotto hydrostatic with the RRS clamp purely based on what feels better to me. For many it is probably a step in the wrong direction, to me it just handles better and more importantly, I'm much faster with it. The BH55 was nice but after the last shoot I did where I had the tripod twisted in a weird position and I fumbled too many times with the RRS head by mistaking the torque screw with the pano screw. It pissed me off. No way that will ever happen with the Manfrotto head. And besides, my heaviest setup is under 5 lbs. All I need is a reliable head that is easy and fast to set up.
This is a whole new topic, but I personally think that this is one part of my set up where I really don't need to spend mega bucks to get high end performance. If my images are sharp with a Manfrotto rig, why upgrade? I had the best RRS tripod with the BH55 on top of it. Nice, sure .... it didn't make my pictures sharper and I wasn't faster with it, didn't save me any space and it wasn't THAT much lighter so why keep it? Oh, and I much prefer the flip locks on my Manfrotto legs, much faster, just as secure.