I have 2 PSA upper with FN Hammer forged barrels. Both have been excellent shooters, under 1.5MOA 8 shot groups with cheap PMC Bronze. I can't complain about that, that's excellent.
I've also order build kits, misc parts, magazines, and other odds and ends from them. Probably around 20 orders in total. They have a habbit of splitting orders up into different shipments, but eventually i've always gotten everything within 2 weeks. Uppers took 15 business days as advertised.
My experiences have been excellent. Unfortunately PSA has been a victim of their own success and the gun industry success right now. With their crazy low prices on items, they have too many customers. More than they can handle sometimes. So just don't have the best expectation in shipping times, and you really can't ignore their prices.