Bob,
I used the same company as Lee but their LA / Santa Fee Springs location. The guy to talk to is Luis @ 562-756-3727. As mentioned, my plastic sleeve broke during shipping. Luis called me and told me he might be able to get a replacement out of Arizona. That one came in broken as well. After that, I worked with him and I made a new sleeve. He has a (vacuum) test stand and the booster tested well. (My car is not running yet)
To answer you question, I like working with them. Very helpful. I think he originally quoted me a couple of hundred bucks for a straight rebuild.