Reason I ask is because I'm still on PR1.1 and everything seems to be functioning fine(unlike my previous two N9's which had faults and had to be returned).

Have read quite a few comments of people finding bugs in PR1.2, and also excessive battery drain when compared to PR1.1(although to be fair this is balanced by others saying they're getting better since the update, and perhaps a reboot was all that was required).

So, simple question, does anyone regret updating to PR1.2 that can advise me any reason why I should hold off?

Consider me cautious but I've had phones that I've regretted updating in the past?