It's not clear if they have changed anything on the SM to help with overheating, I wonder if you would have the same issues with a SM but at least there's not much overheating (if any) in this range vid.I have ridden my EX on a few tracks and it works well on small tracks. On tracks with longer straights you can only ride for 10-15 minutes every 2 hours (3groups x 20min sessions skipping every other session for charging and letting the battery cool down) as the longer straghts eat the battery like crazy and cause the bike to cut nearly all power because the battery overheats.