My recent dive into the Arca quick release system was partially prompted by getting an Arca P0 head. I was looking for light and compact without giving up weight payload capacity. It holds my 553 ELX fine, as well as my 5x7 field camera. I bought the version without a QR clamp, so I could use it on its own if I wanted, then added an Arca-Swiss knob-type QR clamp.
One thing to note, the newest Arca-Swiss clamps are designed to take both their new style plates as well as the wider “universal” Arca-type plates. However, there is no “safety catch” for universal plates, so some caution is needed. If that’s important, I’d consider pairing an RRS clamp with it. I tried out an FLM clamp, which is nicely made and works well, but it slightly interferes with the P0 head’s panning lock.
The head is awesome though.