I worked with them for a bit a few months ago...they have good prices, but I was never ever sent a picture of a stone even though I must have asked about 20 times (through email and phone)....I'd rather call IDJ or excel diamonds, they also have really competitive prices...
USACerted used to sell quite a bit to Pricescope people. Back in early days of PS. I contacted them back in 2008 or so when I was looking for a larger diamond. Nobody responded to the web form requests I sent, and I didn't phone them. I ended up buying someplace else.