PING offers the most time-tested and precise custom-fitting process in golf, one proven to generate the optimal ball flights and consistency you need to shoot lower scores.
I have done it recently (just for irons). I enjoyed it and would do it again. Really liked that its outdoors at a nice range with trackman.
That said, its not as well done as a CC fitting imo. If it wasn't free, I would have liked more input from the fitter. I was basically guiding them on what I wanted to try. That could be fitter dependent. There were about 7 of them there.