I own the P10 though I have the Aphelion 2 cartridge. I love love love the form factor. It's what sold me on this TT. And I have mine mounted to my 165 year old factory loft 18" brick wall using the Rega wall mount unique to the P10.
A couple of bugaboos - my Aphelion went dead on the left channel after only 20hrs. RegaUS distributor handled it well and very quickly. But still, just 20 hrs. on an up-charge cart?
Second, the P10 PSU does not turn off. It's been an issue since the day I received my TT (so also as it left the assembly plant.). The ON/OFF switch sticks either in the on or off position. A call to Rega distributor/support was immediately answered with, "Yeah, that tends to happen. We suggest you gently tap the PSU case with a light hammer or mallet or piece of wood. And if that doesn't work then just loosen the rear torx screws holding the case cover to the unit." I kid you not. For around $11,000 they want me to take a light hammer/mallet/piece of wood to my PSU. The starter on my 1968 Chevy Impalas' starter? O.K. I get that. But not on the PSU.
Lastly, the cueing drop does not drop perfectly vertical. It tend to drift ever so slightly to the inside just a groove of two. I've adjusted my cuing technique. But, again, really? with a close to $11,000 piece of equipment.
But absolutely love the look and form factor. Wall mount to the brick is SOLID.