I would like to know your impressions about the BTS on Deeluxe Indy boots http://www.alpinecarving.com/boots.html

Does it have the same problems as the RAB, like shows this video from jacques & Patrice https://www.extremecarving.com/attachments/RAB.wmv or does it work well ?
It seems to use a lot of place behind the boots. Does it take too much place ?... Does it tuch the snow faster because of his largeness ?
Thanks !