Hi buttout (love that name!)
There are a number of posts here from those of us who've seen Dr. Shen - you might still be able to find them by clicking the "find" button and searching for Dr. Shen. But here's my experience ...
I'm not sure what you have scheduled - office appointment? Pouchoscopy? Other tests? My first visit was an office appointment and we - my husband and I - sat in his office and discussed my situation (pouchitis/cuffitis/fistula). He explained everything, drew pictures on the board, etc. We discussed options and also did a quick look at me "down there". He was very generous with his time (which explains the 2+ hour wait - bring a good book). I always suggest taking a small recorder and asking him if he minds you taping the appointment (he won't mind). So much is discussed, and he has a rather strong accent, so it's nice to be able to review it afterwards.
He wanted me to come back for a pouchoscopy, but he squeezed me in the next day. He ordered lots of blood work which was done the first day. Some of those who've seen him had other tests ordered and done the same day or within the next day or 2, so you'll want to book a room at a hotel for at least a couple days.
I hope everything works out for you - if you have other questions, please feel free to PM me. Let us know how it goes!