I can say my dealings with JGS were fantastic. They answered my email very quickly and emailed me the approved copy back in 1 day. From the time I first emailed them until my reamer was ordered and in process was 3 days.
They quoted me 5 months lead time and beat that by a few weeks. I was very happy with them.
As far as other manufactures, I waited several months going back and forth with emails and phone calls trying to get a print approved before finally getting an answer that my reamer had been sent through to get made. Then it did not have the correct dimensions when it arrived.