Not sure if I need to make a "introduction" post and I'm extremely sorry for necro'ing but I found this thread while doing a forum search for the stability shaft. I've read the whole thread. I recall seeing a few people ask for what is essentially scientific testing from unbiased 3rd party sources. I believe this has been done by MyG0lfSpy (not sure if I'll get banned for using their name... I know on other golf forums you can't even have the letters M-G and S in a row) somewhat recently.
IIRC, their data showed this shaft seemed to neither help nor hinder golfers, with maaaaybe a long term improvement on sg18 putting. Essentially, I read their test to say "if you're already a good putter, this will probably not help. If you're not a good putter AND you have $200 to burn, this *might* help you, over the course of many many rounds."
Again, apologies for the necro of this thread. Have any other users gotten their own data since the last post in 2018?