Had Alan and James do a CLA on my black Leica II to IIIa-syn conversion and they even took the time to make the 1/1000th speed spot-on.
The Leica II has a 1/500th top speed and with the factory upgrade to a IIIa comes a 1/1000th shutter speed button that actually is still 1/500th. But they took a minute amount of metal off the shutter latches (!) so that the whole shutter could be fine tuned to actually give 1/1000th at the selected speed.
Like Rick says, it took a little while to get going from the work backlog but it went quick once it started and I was informed on all work being done in a very complete and timely manner.
The camera wasn't repainted but I've seen their repainting work online and it's marvellous. They showed an M3 with 50mm Summicron repainted to black and it looked factory new and original, a real stunner.
Wholeheartedly recommend them, I will be sending them my early-production Leica II soon, somewhere next month I reckon. This just has a 500th top speed, should be less troublesome for them 🙂