I've only had one problem with Performance- I ordered some sunglasses and it took almost 7 weeks for them to arrive. Turns out the sunglasses weren't in stock. I wasn't even notified- I recieved my shipment for the order I placed, and after a day or two, I did a quick check, I saw the sunglasses weren't there. When I called, they said the sunglasses were not in stock. I was like "why didn't you tell me the sunglasses wouldn't ship and why were they on sale when they were out of stock to begin with?". They had no answer. I did eventually get the sunglasses, but after using them for a few weeks, I now realize it is a piece of crap, which is why they were probably on sale in the first place!
Still, for all the money I've put into buying stuff from Performance, my hassles have been few and far between. Overall, I get my shipments at a decent time, I have a ton of Performance coupons, and I've barely had problems with them. I go to the store too, and they are pretty good to me at the store.
Koffee