Staff note: This post may contain affiliate links, which means Pentax Forums may earn a small commission if a visitor clicks through and makes a purchase. If you would like to support the forum directly, you may also make a donation here.
I've found PF to be friendly and laid back overall - I guess I haven't visited those other sub-forums. I also participate in a Sony E-mount forum, and it is friendly and laid back, too. I have a Sony NEX-5R, a K-30, and a Q. All 3 have important niches in my schedule, and the Q is about to enter the aerial photography realm. It is always a risk when you launch a model plane with a camera, but the rewards are well worth it.