My biggest worry with that type of roll would be landing on my head if my arms were cut out from under me. I'm thinking specifically of sumi atoshi when you use your inside arm to cut under uke and prevent him from putting his lead hand down, forcing a breakfall. Whenever I've done ukemi over anything higher than waist level, I've gone over in Superman pose and then twisted into a right or left roll at the last second.
On the flip side (no pun intended), if you find it works well please let us know, I'm always looking for new ukemi tricks
