I just got back from shooting my new P-415! Shot 160 rounds total, 100 suppressed. I had one light strike, put the bullet back in and it fired the second time around. Other than that I didn't have any issues. I even did some suppressed bump firing (the first time I've ever done it). I'm very happy with the performance so far!
Some observations...
Mine didn't come with the ambidextrous magazine release hardware, it has the normal mag release parts. I'll probably call up POF about that to see if they'll send me replacement parts. It does have the ambi safety and ambi bolt release though.
It does not have the roller cam pin, it has a normal looking cam pin. I get the impression the roller cam pin hasn't actually been released, so that's not a big surprise.
There is some distinct wear where the cam pin has rubbed against the upper. I'm inclined to just "live with it" unless it gets real bad.
The lock-nut on the end of the barrel (the "collar jam nut" as they call it) is very handy!
The grip is too big for me, I think I would prefer a smooth plastic handle.
Mine came with a Tapco polymer mag, the person I bought it from said it would come with a C-Products mag. I'm not complaining, I'd probably prefer the Tapco, I'm just curious if I got a mixup or something.
So far I do not seem to have any evidence of carrier tilt.
I don't have much experience with ARs, but just so this list isn't mostly small negatives let me add some positives...
The rest of the gun seemed to work just as it is suppose to, as far as I know.
Asside from that single light strike the trigger seemed to be great (it looks like I got one with a Timney trigger).
The barrel is real nice looking, it appears to be high quality.
I haven't done anything but the initial cleaning yet (like I said, I just got back, my suppressor is still too hot to hold) but it appears the NP3 coating really is teflon-like (slippery, easy to clean, etc.).
Although the barrel and suppressor got very hot, as far as I noticed the rails stayed cool.
I cannot comment on accuracy at the moment. I consider myself a decent shot, but I'm not great. During this trip I didn't even take the time to adjust my Eotech from my previous gun (an FS2000).
I intended to take some pictures, but when starting to record a video of the very first magazine the camera informed us that I had forgotten the memory card at home. :( I took some video with my phone, but for various reasons I don't want to post them. I'll see if I can get some decent screen captures out of them though.
[later]
http://www.fantasgreat.com/forums/ar15/5shells.png