The only other bit to be wary of with a fitter is to understand exactly what they'll give back to you. I've heard of some who've gone to a fitter, with the same thought -- so they in theory would know what size bike to get. Instead, after the fitting, being presented with a lot of metrics that, unless you know what you're doing, can be difficult to translate into a specific bike size or brand. Such as getting back metrics like: Saddle height to pedals, saddle distance to handlebars, saddle setback from BB, handlebar drop from saddle, handlebar width, crankarm length, etc..