Over the past 2 years I've ordered most of my reps from Precious Time (PT) and Pure Time (Angus).
Although PT has an excellent QC and I can highly recommend him, 2 high beat 7750s turned out to be low beat after inspection by The Zigmeister.
I do believe, however, that PT wasn't aware of this and simply got fooled by the factory. But irrespective of the collector, you'll never know for 100% what's inside your watch unless you're a watchmaker.
Angus on the other hand has poor QC, but excellent after sales. Most of the reps I've bought from him had minor productional flaws (crooked markers, crooked hands, screws falling out of the movement, incorrectly installed Swanneck, scratched hands, wrongly installed stem). But he always corrects his mistakes by immediately sending replacement parts.
Since I've learned to do small repairs and mods to my watches and Angus has lower prices and a wider range of products than the EU collectors, I'm really fine with ordering from him and I'm taking for granted the possible inconvenience of waiting for replacement parts.