I have been going to Dr. Manuel for many years. He is a very knowledgeable and experienced! When I was in the the Air National Guard @ Ellington, he was there also, he gave the vision exams for all the pilots. When I left there and went to work for a contractor for NASA, he did the vision exams/consulted for the Astronaut Corps. He is very well rounded and intelligent and I highly recommend him and his staff. As some of the others have said, the wait is at times long. But, on the other hand, when it comes to your vision and eyes wouldn't you want the best even if there is a wait?
Pros: Comes highly recommended, very experienced and knowledgeable
Cons: Wait time on occasion