Rode my 508 DOM at a couple feet overhead in thruster setup. No problem with sliding out on the face or anything like others have mentioned. But when I had a good deal of speed from big drops I find it tough to set the rail for the bottom turn and roundies. Had to nurse it through turns at speed a bit more. But then I bought a Hellfire and am now just fine in that scenario. :) Still have my DOM in the trunk every day, though. The thing goes so good and packs away nicely.