We didn't have a soft brush there, it's on the way here. W were only comparing the teflon and the metal vac shoe/brush heads. Which felt exactly the same to me.
Rotovac has upgraded the 360XL to a 3/4 hp motor to better handle the resistance of the brush heads.
Before you decide let me see how quick they can get me the Teflon/
Glide head to compare on real carpet, not installed over lumpy asphalt.