I've got a P1 that was originally purchased in June 2011. Lots of use, though not the only
mod I use. Never a hitch. Since the P1's ohms limits were showing up more often (due to change of atty I use), I very recently sent it in for upgrade, so I guess I'll now have to call it a P2.
I have another older one that was upgraded to 2.0 when the upgrade came out in late summer/early fall 2011. Energizer bunny, too!
And these are some of the reasons why I say ProVi for rugged reliability.