Just received my Firm and Medium Ridge today. After a long day at my local course I have come to the conclusion that I like the Medium more for putts and the Firm off the tee. They both fly pretty similar off the tee and for approaches though.
I turbo putt a lot and I prefer the added friction that medium provides on my fingertips. I'd say Medium has less low speed glide than Firm. The Firm Ridge was easier to release cleanly on hard rips and had a little more glide, that's why I like it off the tee.
It wasn't exactly a seamless transition from throwing Wizards, but I made a few nice shots. I think I'll work with them over the next few months and see where I'm at before I fully decide on bagging them or not. I expect the Firm to break in a little more than the Medium by then.
I'd say it's more of a personal preference than an actual difference in performance between Medium and Firm out of the box. It sounds like Dana Vicich, one of Vibram's top sponsored pro players, prefers the exact opposite of what I like. He's rated higher and has way better lettuce than me, so maybe his preferences are more practical.
