Another use for it I find is any opponent hanging on the ledge.
If you do a full jump nair (hold y and a at the same time or x and a) and they are trying to get up, a number of things can happen.
1. They attack. Usually the attacks are low, like snake's for example, which sweeps the floor. Since you are jumping, you go over it and hit them right back off the ledge.
2. They jump. Since you can take damage the moment you are off the ledge and this move has 2 hits with lasting hit boxes, this usually hits them.
3. They roll. They might roll behind you but as others have said this is autocancelled with a full jump nair, so you can turn and tilt or smash or jab or whatever else you need to, shield or spot dodge if you have to.
4. They can hop off the ledge and fair or something back onto the stage. Again, since this move has lasting hit boxes and what not, the worst that should happen is a mutual hit, sending them off again (in which case you rinse and repeat).
5. They can just get up, and as we have said, the lasting hit boxes can be annoying to others.
6. They can jump off and cling to the ledge like a chicken again. In which case do this all over again.
This takes timing and prediction, guessing or reacting quickly enough to what your opponent is doing. Be careful, if you jump too early and get hit by an attack from the ledge it you could send you off the ledge, reversing the position; jump too late and you just get hit. It's all about timing and prediction, peoples.
Just my personal use of the move =)
And when they are in my face. Faster than fair/dair and it feels good to land both hits =)
