I too had a bad experience with performanceproducts.com.
I ordered the SAW 2.0 racerunner kit - coilovers, rear shocks, and 1" block. They advertised the shocks as precharged with Nitrogen, but they arrived empty. Of course, I didn't know this until after they were installed. The front coilovers could be charged while on the truck, but the rear shocks had to be removed (location of the valve).
I ended up having a motorcycle shop fill them for me and they charged $75! Obviously way to much, but I had no choice. We have 2 4wheel parts stores in the metro Atlanta area and neither of them can charge shocks with Nitrogen.
When I called performance products to let them know what happened and to get some money back, the guy gave me a hard time asking "Who authorized you to get the shocks filled for $75?" I said no one did. I had no choice in the matter as the only place I could find to fill them charged me $75. They didn't seem to care that I had to remove the rear shocks, waste my time and gas money to go have these things filled when as a retailer, they advertised them as precharged, but did not deliver them that way.
In the end, they REFUSED to give me any credit.

I won't buy anything from them again.