It's not the tools or "system" used, it's the fitter. http://www.jbvcoaching.com/BikeFits.asp
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This is very true. I've been fitted a few times over the years by different fitters using different systems. The results, while not identical, were largely in the same ballpark with the exception of one guy whose fitting would have injured me had I followed his recommendations.
The systems are all just pretty tools to charm the uninitiated so they feel that they're getting their money's worth with all the flashing lights and computer printouts. In the end, it all boils down to the experience of the person wielding the tools.
The tools just churn out hard data. The fitter needs to interpret the data. So don't choose a fitter by the tools that he uses. Look for one who has a track history of fitting average and non-average people well. Ask around and you should be able to get a few names.