[Ball Head] I was a little skeptical because of some of the complaints of the flip lock lever, and the floppy tightening ring. Both complaints are misguided! The lever is a brilliant solution and provides an excellent safety interlock. There are two catches that restrict the opening of the lever. This is a very good thing! The first catch is obvious and needs to be lightly pulled to open the 1st 90 degrees. Then one can see a ribbed rod within the lever that sits right at your fingernail which, when pulled lightly, releases the lever fully. This is the best safety interlock I have ever seen. As for the so-called floppy tightening ring, the manual states clearly the the play is necessary for proper function. It is silly to complain-the ring is very easy to operate. All in all, the best ball head I have ever used. It is crazy strong and light. My carbon fiber tripod FINALLY is really light like it should be! And with the rotational function above the ball, one can shoot panos without an added pano accessory. That alone should save a couple of hundred on the rig! Highly recommended!

[Yes] The Fliplock is easy to operate and the straight forward two step design requiring deliberate actions on my part means distractions or confusing controls wont cause me to release my equipment inadvertently.  Adjustment to the Small Rig L bracket width was straight forward.  I do recommend using only one manufacturers brackets so you wont have to readjust the Fliplock clamp width.  The p0 does sit atop the RRS TQC-14 Mk2 with clearance above the quick column lock collar.  The p0 wont fit between the legs of fold back series 1 tripods without impacting the legs, but the p0 is such a pleasure to use Id rather add the extra length leaving the tripod unfolded or remove the ball head (when backpacking) than opt for a different ball head.  The p0 will securely hold more weight per ounce of ball head than any of its competitors and its design means you will be shooting panoramas with a level horizon while other brand owners are adding on their heavy leveling base or disassembling and reassembling their ball heads for a panorama.  The 3.5 pound combined weight of the RRS TQC-14 and the Arca-Swiss p0 mean I will be climbing to the top of a 14er this summer with my gear rather than opting to leave it behind as in years past--no more regrets.

[Yes] In response to Howard request, I am expanding my earlier review without mentioning previous comments. This a solid ballhead and when is locked it will not move. I have owned other Arca-Swiss ball heads as well as Markins, Manfrottos, Feisols, etc and this has been the best for my purposes. It is compact and is the only that allows to reverse the legs of the tripod without interference due to the various knobs in the other ball head.I selected this ballhead because is compact, travel friendly and can be used for landscape as well as bird photography with the rig I built using Hobu side arm and an aluminum block to use similar Wimberly Sidekick or Swing platform. Photo is included. So when I am in the field I only carry this rig and when I use the ballhead, I just remove the rig and becomes a ballhead. Another advantage is that is serves as a leveling device so one does not have to worry when the tripod is not leveled.

[Ball Head] とても気に入っています。

[Yes] great design and build quality. The best part is how compact it is. saves a bunch of space when traveling

[Yes] I discovered this ballhead while on a photo workshop. The instructor had it and was showing it to others. The collar locking mechanism is so intuitive and precise, setting the camera right where you want it without trying to keep it from flopping over is trivial. The only downside of the p0 he had was that it came with the non-classic quick release system which would require new plates (the instructor added his own rrs qr to the bare p0 ballhead). Arca seems to have backpedaled and introduced this model with the classic Arca qr flip lock. Operating the lever is simple and easy. I absolutely love this thing.