the head is unconventional, however it's easily my favorite for landscapes, it's not even close. Ballheads will be ballheads, always feel a little finicky in use, but the Arca planetary gears..... simply amazing. I've only had two other ball heads comparable in price, RRS and Kirk..... the P0 stayed with me.
stuff I really hated about normal ballheads.....
tension for fine tuning, Always felt it was difficult to find the right amount of tension for precise movement, and this would vary with different lenses. I typically find tension very quickly with the p0. That aspherical ball helps against flop.
snag! just the extra protrusions here and there would snag on stuff occasionally, just annoying.
Weight, typical stuff in this class generally weighs a bit more.
Tightening, seems like the planetary gears win it again here, a tight grip is really tight and doesnt need much pressure. Typical ballheads need some tension on the knob and it can get uncomfortably tight since the knob is physically small compared to the ring. Larger diameter + gears = easy peasy.
panning on top, I dont need one on the bottom.
at one point I was running a leveling base + ballhead. Had to level twice way too often.
Biggest reason for not going with acratech in the past was due to the aspherical ball offered by Arca swiss. Minor details like this are kind of a big deal. On paper, the Acratech is more well versed, however well versed means that it's a better Jack of all trades, and I wasnt looking for a Jack, but a heavenly landscape head, and the p0 is just about there.
As for weather sealing, I think mine has held up well. I dropped it in a sandy puddle and was sure it would be toast...... good as new after the sand worked itself out. Not sure where the sand went, but it's gone. Might be that the inverted design just doesnt do well at holding sand, and that gravity just flushes it out of the system over time.
Sony A7rii/A7riii - FE 12-24/4 - FE 24-240 - FE 28/2 - FE 35/2.8 - FE 50/1.8 - FE 85/1.8 - EF 135/1.8 Art - F 600/5.6 - CZ 35-70, 100-300 - Astro Rok 14/2.8, 24/1.4 - Tamron 28-75 f2.8, 70-200 f2.8 VC