Yeah, they put me through the SAM lab which like you said validated what I already knew about my putting stroke. That being said, I did like the process and think that it was beneficial. I do wish that I would have received the print out from CC of my putter fitting.
In terms of the justification of the stability tour shaft, it wasn't. Basically, I watched the TXG video prior to going to CC and wanted to know more about it. After trying out several putters I narrowed my search to the PXG Closer and the Evnroll ER2B. When you go to CC they don't have different shafts to try with different putters. They had the original Stability shaft on a no name putter. I hit the two putters I was interested in, made my decision, then I tried the shaft on the CC stock putter. I might add that the other putter was much lighter in weight. Definitely wasn't apples to apples. From there the CC rep said he really liked them and had been fitting a lot of people in to them, and mentioned that they had another option that had released recently, he told me that the Stability Tour(which matched the color scheme of the Evnroll better as it was black/ red) was made with better materials, had a slightly thinner profile. At this point I was committed and made the decision to go "all in".
I want to be clear, I am extremely pleased with my set up of the Evnroll ER2b with stability tour shaft. The fitter added one inch to make playing length 35" and we took the loft to .5. Putts per round are down, which is directly related to getting a new putter in one of a couple ways. 1) Fitting- this putter is fit to me, I know its to my specs and I find it aesthetically pleasing. There is something to be said for lining up over the ball and knowing that the club was made for YOU. 2) Practice. I am practicing way more. I practice at home while watching football during the week and I have gone to the course to exclusively practice putting 3) Combination of both.
All in all, it was a good experience. And the next time I go in, I will go in with the knowledge that they will attempt to up-sell me on things. Yes, I will go in again, thinking about doing in iron/ wedge fitting/ gapping in the winter. I am hoping I don't come out of there like the youtube Mr. Short Game with a full set of LA golf shafts.