I recently had repairs done on my sl66 by Jurgen Kuschnik and he did a thorough job on it. The turnaround time was very quick (less than 2 weeks), which I understand may not be the case with Harry Fleenor. That was my main consideration in choosing JK; I don't know about cost comparison, but from the research I did, felt that it was going to be an expensive proposition anyway (total was about $400 to unjam the shutter, correct a 3-degree error in the tilt, and do a thorough cleaning/lube).
I don't have the contact info handy but it should be easily found through Google.
Good luck! It may be helpful to give a report back on how you make out as it seems there are quite a few sl66 users here at APUG.