With SDI (ASDI) you can sometimes manipulate an opponent's attack to send you into the side of the stage, which can be Tech'd as usual. This can let you survive edgeguards like Falco's down-air or down-smash at ledge.
By holding up on the analogue stick, you can walljump from a ledgetech, which can sometimes open up a counter-hit opportunity or an unexpected side-B recovery.