I have been a TFC patient for almost 2 years. I started with Dr. S, then moved on to Dr. H, but Dr. B did two of my four IVF transfers (I've also seen Dr. V for monitoring apointments on occasion and he did an IUI for me once my Dr. S was out of town). I really like Dr. B, and in general the practice is incredibly well run and professional (I'm really learning to appreciate that now that I'm with a regular OB!). My BFF was also a patient of Dr. B's and she always felt like she was kind of awkward, but I've always really liked her. She's kinda nerdy, but being smart is partially what makes her a good doctor! Hopefully, liz4paws will chime in here as well because she also has experience with TFC.
I don't really have any advice for you on questions to ask, because appropriate questions really depend on your diagnosis. Good luck!!