FWIW, I've ordered almost everything AR15 I've bought from PSA.
I have ordered 5+ blem lowers... They have always been packaged well (individually bubble-wrapped, etc). Same goes for my other orders. In fact, if anything I would say some things have been ridiculously OVER-packaged.
I've never had a problem with PSA delivering what they promised... Usually when there is a shipping date or window posted on their site, they've hit it. Admittedly, though, they just barely hit it - that is, things went out the last possible day to meet their promised ship window. But, hit it they did.
I think PSA has one of the best value propositions out there for their customers. In my experience, they have a very good product at a very reasonable price. For that, I'm willing to wait and tolerate some of the bumps in the road that come with buying from them (in terms of timing).