I did self fitting for a couple of years and a couple of bikes. Then I was offered a free fit from a Trek retailer since he was a friend and had just got back from fitters school. It was not a "complete" fit, there was no complex computerized foot/knee/clip alignment. Just the basics. Saddle height, fore.aft, stem height/length, basic cleat alignment. He took a number of body measurements and tested my flexibility. What I gained was a lower saddle, shorter stem, and much better comfort and power. As a beginner, it was tangible. My hamstrings have finally started to get stronger now that my saddle isn't too high. Would I have paid the $150 for the fit on my own? Probably not since my bike isn't that expensive. Should I have paid? Absolutely. Will I pay someone to fit me again? I probably won't have to, unless I buy a TT bike, which is unlikely. It is most certainly not voodoo, but neither is it a panacea for your cycling problems. For me it was a positive. If you are comfortable and powerful it may not be needed.