I've skied it - I'm the tall heavy guy in Joels latest vids skiing terribly on a 67 and generally just clowning around having some fun on the water, which is easy to do with @JoelHowley. I actually found something positive about all three tail blocks - what I can say for sure is that each tail block makes a significant difference to how the ski performs. I was shocked at how different each one was - I can see this evolving over time as people experiment with different tails. I think it is a great idea - especially for someone like me - I'm 240+ pounds skiing long lengths with a hope of getting shorter soon - so as I get fitter, lighter and skiing shorter ropes I can then perhaps go from the stock to the round... Those vids of me skiing are pretty bad - haven't had a lot of time on the water due to covid and winter over here. Skiing a 67 took a lot of effort as well - more than I thought it would. I can't wait to try a 68 one day when I'm skiing more consistantly... I can say Joels knowledge about ski design and performance is next level - the guy can talk all day about the subject and why he truely believes in the Connell philosophy on ski design.