I've done three orders with them so far and have built four of their PCBs - all have gone very smoothly (I have three others in progress right now, waiting for various parts). There are some good people on the forums as well if you need help with troubleshooting. But I think that if you're meticulous with the building process you'll likely not have any issues. The first PCB I built from them I tested, but after that I've just gone straight to boxing before doing any testing. I put the protection diode in wrong once but other than that, which was a quick fix, they've been good to go. I'm blown away that this is a one man operation.