I believe that John_V had a Retul Fitting last year, he said it was money well spent and that he would do it again. Perhaps he will see this thread and give you his experience with them. My LBS did an "old school fitting", by eye and hand, not a complaint on my part, it worked well. by watching me after some measurements and having me sit on a the bike as things were changed or adjusted. They adjusted the seat height, fore/aft placement and the stem height for me. These were all I needed at that time. My ride is pain free as my bike is now set up and very comfortable on long hauls or quick rides.
If any of our LBS ever starts a Retul Fitting operation I am going to have one done, I am checking the Atlanta, Ga area, where our daughter lives, for a shop with this service. I'll be up there to deliver her bicycle to her in the middle of the month. Others here have posted about using a fitting and I feel sure that they and John will post here.
Bill