When I first got my Regal going on 7 years ago, I placed quite a few orders to G Body Parts because at the time they had by far the largest selection (that I was aware of) of reproduction G Body stuff. OPGI didn't even have a G Body catalog, neither did Classic Industries, Kirban dealt in Turbo Regals almost exclusively, and I wasn't aware of Mike's Montes or Dixie MC. I never had any issues and Brian Weaver used to post here all the time as did Toby Pawlaczyk so if you had an issue you could PM either of them and it was quickly resolved.
Then I got busy with some other projects and ended up taking a 2 or 3 year hiatus from my Regal and I was sparsely logged on to GBF. And apparently in that amount of time, things changed drastically, because ever since, I've heard of tons of order issues with GBP to the point people are questioning if it's even a legitimate business and we never hear from Brian Weaver or Toby Pawlaczyk anymore. I believe there was some drama that went down that I don't know or care to know the details of, but whatever occurred seems to have affected their business, at least from my observations. I haven't placed an order to GBP since then, for a number of reasons, the numerous complaints being one of them. Most of their stuff I've been able to buy cheaper elsewhere being another.
Unless I start hearing better things about them, I probably won't order from them again. There's no real reason to with the huge increase in G Body aftermarket support from other vendors.