The revolving ski decks have been around since the 60's and trained world champ free style skiers. See the Aspen ski doctors run by 3 x world champ John Clendenin as well as Virtual Snow in LA run by 2x world champ Bob Salerno. They both use the revolving ski decks to teach and train their students. If its good enough for them it must be good.
The SnoZone Endless Slope in Sacramento and in San Francisco (www.endlesslope.com
) is a great way to develop ski techniques, train muscle memory for skiing, conditions the ski muscles, build strong core balance and establishes proper proprioception for correct and rapid reflexes.
There is a revolving ski deck at USC med center used for rehabing injuried athletes.
You have to use the Endless Slope many times and then you realize what a fantastic training device it is. Just a few times on it is just the begining. It is like coming down a double black diamond run only once or a couple times and saying theres nothing to it I don't need to go on it ever again.
Regarding Inline vs Endless Slope with the Endless Slope you are actually on skis and are tipping the edges, biting edge as well as endlessly skiing downhill on a steep slope. Inline is skating and it is closer to riding snow blades. The endless slope revolving ski deck is skiing it is just one type of ski and terrain condition which is consistant but that is the best way to practice. Like why some racers train in a wind tunnel to feel, engrain the situation so as to fine tune and develop specific skills to better their technique. Hope this helps. I train on one during the off season to be ski ready for the snow season. Works for me!