• Relatively lightweight
• Very sturdy
• Smooth/flawless Operation
• Liquid Level on the clamp (great for doing panoramics)
• Solid Quick Release Lever and custom quick release plates
• Low Profile
• Fast locking knobs to hold the camera where you want
• Good tension knob with a large amount of adjustments possible
• Stylish... and really cool looking
• The quick release lever is long and sometimes gets in the way when removing or mounting the camera with a large lens attached (tripod colar mount on the lens). This however, was more me getting used to the equipment than an actual con. By the end of the first day I had it down pat.
Really, the only other con I can think of is the price tag. This product is only available through the Really Right Stuff website. You can check them out here http://www.reallyrightstuff.com/.
So, why would you spend this much money on a tripod head? The answer is simple; quality and reliability. The very first day I used the BH-55 I took a good tumble down some wet rocks....it hit the rocks really hard (as did I) but the clamp held the camera firmly in place (saving the camera from a watery grave). The cosmetics of the ballhead were damaged but the functionality remains sound. At least now it looks used.... Overall, I wish that I had bought this product years ago. Really Right Stuff has a new and very pleased customer.