Haptics / manufacturing quality - the Sirui makes a very high-quality impression. Everything is precisely machined, nothing wobbles, no game or other weaknesses are detected.
Function - The ball is fixed absolutely firmly with little force. The friction is very easy to dose. The friction is easily adjustable and easy to dose. I had no friction at my previous ball head and have decided, among other reasons also to a new purchase. I have to say it was definitely worth it. There are no accidental tipping with the risk of damaging anything. In addition, you can use the friction very nice to follow constantly corresponds to moving subjects without the head and lock. The holding force is sufficient slack off, to make even with 400 mm nor sharp images - even in the field of a longer focal length for this shutter speed.
When Adjusting the shot I was floored - after fixing the ball to the framing changed little. On the stability of the head, there is in my view nothing to complain about - as far as I can determine it - all pictures of me largest available focal length of 400 mm perfectly sharp, sec up to a shutter speed of 1/200 -. A longer time I never need in practice, since the motifs (birds) also move.
Quick-change system - Super class! Finally a system that really holds bombproof - does not matter what position fixed in the head. Definitely superior to conventional clamping systems.
The Panorama function is the K 30x best - turns silky smooth. Together with the Benro Gimbal example, can be very comfortable to photograph birds in flight.
I can recommend the full head - Top performance at a more than reasonable price. The rating refers to the use of a Canon EOS 7D with my longest lens, a Canon EF 400mm f / 5.6 L USM - total weight approx. 2.1 kg.