Experiences seem to vary, but I've had good experience with Morgan and Cameraleather.com. I've received numerous coverings and even sent him my M3 to recover because I didn't feel up to removing the vulcanite. All handled in a timely manner, although I understand that others have had less satisfactory outcomes.
I've also used Aki Asahi and his turnaround is phenomenal, but a very limited selection of surfaces. In fact, the one he used to offer which I like the best (for Leicas) is no longer offered.