Since the weakest feature of a product but now times decides about his quality, I can not recommend the ball head due to the breakaway torque.
Addendum:
I find it unfortunate that negative reviews are usually rated poorly. Not because it would personally make me something, it shows, however, that many have never had a decent ball head in hand. I can not align on a straight line my camera because the head jumps back and forth. I release the friction, the camera shakes logically around before I can determine it, also it still sags in determining itself. A (too large) ball head of Manfrotto, which came with my tripod, a special layer between the housing and the ball was attached here slipped the ball back and forth gently, although the ball head was already dressed so tight that he held the camera itself ,
I am aware of the problem that a decent ball head will cost significantly more than this Sirui, yet I present the facts are as they are. Who does not require a precise alignment of the ball head, can buy him quietly. People who expect more and do not want to buy twice, to see better elsewhere.
Addendum 2:
Two other issues emerge after prolonged use:
-The ball head greasy. From the set screw and screw the removable disk comes out tough grease and makes the buttons slippery. Can you wipe, but is annoying.
-A unique processing problem: The plastic clip that holds the ball, moves, once the friction intensified and the head is aligned. Eventually, they will then depend, resulting in an ugly jerk. This distinct game turn prevents an exact alignment of the camera and will intensify further, if possible, because I can not remember to have first noticed something about it.
Conclusion:
Processing problems and using cheaper materials are partly no longer be denied. Capable of Sirui ball head's visitation still reasonably (especially optical) to convince the problems with prolonged use increase. The bad surprise comes then probably only if the right of withdrawal has expired.
Addendum 3:
I've been searching for an alternative to Sirui and got stuck in the products from Novoflex. For my system camera I currently use a Magic-Ball Mini, whose Sliding plastic the name is also a value: a breakaway does not exist. Quite outstanding is the handle, which is made entirely of metal and finely ribbed - haptic a dream! The head also holds heavy SLR bombproof, but sags when released initially significantly from, here the big brother Magic Ball is probably 50 preferable that also allows friction setting. However, one must be aware that these heads were designed according to another principle that both advantages and disadvantages.