I've had some fittings done, but I have only really trusted one of them. I've adjusted my fit hundreds of times, and maybe half the time have made an improvement, but I have learned a lot. The only time I really made it a lot better was when I was dialing in my former Woodrup for a 5-day supported tour. My training strategy was to work up to one metric day, then two metric days in a row, then three. The biggest limit in achieving those goals was saddle comfort. Finally I got it, went on the ride with reasonable success, and not long after sold the bike in favor of a 650b. I should have kept the bike. It also has turned out that the contact points for that tour do not work for me today, three years later, so I'm in "figure it out" mode, again.

One of our LBS has a fitter with a very strong reputation, but the only person I know who's had that fitting has not been highly impressed. Sooo, you pays your money and you takes your chances.

But if you have a good fitter (if I could find the guy who's work I liked), it's far more efficient in time and possibly money to have a GOOD expert help you.