so what is the difference?
What are you looking for???
The SL version makes it bounce more. Hayabusa has rubber rims, SL has softer rubber rims, so it bounces more when you drop.
SL = Soft Landing.
Like rsmod said, it has softer rubber rims.
Yes it does bounce more, but if you use the regular version on a hard floor, it bounces pretty high on its own. So each version works just fine.
Hope that was at least a little helpful. ;D