For those of you that are interested and would like to see this product first hand, there is a prototype in a Viper at M&M Powersports in Hancock. This sled is a rental and the HELO actually has ~1300 miles on it so far with extremely positive feedback! Grub, think of it this way, if the rear track shock was completely locked up, the HELO acts as spring and damper in the vertical direction thereby giving the suspension extra travel. I completely understand what you are saying about the bump stops on the rail and being the limiting factor in the fully collapsed condition, but we gain extra travel when the suspension is fully extended.
We plan to have this product available for coupled and uncoupled suspension in the fall and should fit most sleds made in the last 10 years. There are a few exceptions including the T-motion and Rush but we are working on a solutions for those as well.