The "science" of bike fit for road bikes really hasn't changed all that much over the years. Unless you have functional challenges, an "old-school" fitter with decent amount of skill can get you pretty close to optimal with a basic fit. The main reason people invest in a "pro" fit is to correct problems that are causing discomfort on the bike. The systems use video and motion capture to help the fitter get a better look at what's happening on the bike so he/she can evaluate the effect of smaller changes more quickly. Some people will swear by one system or another, but there's no magic in the "systems". It's really just about the fitter's skill in using the system (and knowing when to deviate to meet your individual needs). If you don't have any "problems" you want the fitter to correct, then you may find the return on investment to be a little disappointing.