i've got about 150 miles on mine so far, and i would say its a noticeable difference. For me it seems like it took away the "pivot transition" point, the sled now just smoothly rolls from side to side with out a "breaking point". i am very happy with this as it just makes you a smoother rider. for apples to apples comparisons mine is on a 2014 pro with ice age rails, 8" rear wheels, zbroz hd rear springs, 156 X3, zbroz 36" front end with their dual rate front springs, all stock shocks.
have a buddy with same suspension track set up minus the t-motion that was with me last ride and we swapped back and forth quite a bit. He felt like it rolled too easy and he likes the "break point" of his set up a little better, however he was riding his sled all day and switching to mine for minutes at a time. i was a little worried that it would push and roll harder in the corners on the trail but if anything i would almost say its better than my last years set up but i also added slp mohawk skis this year as wells so i'm sure that is playing a factor.
All in all i'd say its a great product and will help riders take their game to the next level. I recommend them to all of my customers, great quality product again from IceAge