Summary: I note all the others have said. I do not regard its weight as a "con." It is heavy but stable and suits my Sigma 50-500 (bought around the same time) very well. I guess I could always fit a level to the camera hot shoe and, of course, I believe some modern DSLRS have electronic levels built in.I find the quick fit attachment for the lens just the job.
Pros: Easily Adjusted, Good Footing, Locks In Tight, Smooth Movement
Summary: Having purchased this head to support my Canon 500mm F4 Lens I can say that it is a very solid piece of metal that does the job well. The ability to pan easily and adjust the balance of the lens is exceptional.My only gripe is that it is difficult to lock the head in one position which can make carrying a tripod with the head and lens attached difficult especially over any real distance.Overall a great buy at an affordable price that does the job well
Summary: If you are a wildlife photographer who is happy to set up a site and just observe and shoot then this product is great. It has a lovely smooth action which follows birds in flight is easy to manouver and does exactly what you expect.Its limitations however are that it is quite heavy and actually not that easy to carry around.
Pros: a lot cheaper than other such devices, Easy to manouver, Smooth action, solid and well built
Summary: I had been wanting to get a tripod head for` in flight shots` for use with my Canon 600mm. I had considered a Wimberley, but at over £500, it seemed grossly overpriced. A professional friend of mine told me to look at the manfrotto. He had seen and tried one out at the NEC against a wimberley, and he thought the manfrotto head was not only better value but a better product.He bought one,and when it arrived he let me try it out.
Pros: Excellent value for money, Solid build quality
Summary: Unable to justify 500 quid on a head for my 500mm lens I chose the Manfrotto. It is a quality piece of kit and solid as a rock. My only complaints would be the weight and the lack of locking machanism for carrying over your shoulder (the head can be tightened but requires a small allen key and is fiddly).Overall a great product for general use.