I got mine and it works great (BXA post) also got a large amount of other items... was there a long wait and multiple promises...yes... but that's the way it goes with custom items. In the end I got my items and I was in no rush for them. Preston may make people think that they are getting them sooner then they actually will. But he was just starting out! I tested him out with a few custom jigs as well and he delivered as promised.
I made enough mistakes when I started and am glad I stayed away from AZ with my goods, it only takes one poison spreader to create chaos.
I will say though that I did most of my communicating with him through Facebook and he seems to get back to me quickly.