Napilopez
Smash Lord
I believe usmash is invulnerable during the jumping animation. Charging usmash helps, because it releases into the invincibility frames quickly.Whaat.
My problem with it is its starting lag- you're very vulnerable while sliding and starting U-smash.
It's still very punishable.
If its spaced appropriately, I think Sonic has enough speed to avoid being hit out of the initial lag. After all, you don't wanna hit with the first hit anyways, so you should be spacing it so it conencts a little late, in the "safer" part.
Its not to say usmash is spammable though. Not at all XD. Just a good damager to use now and then. I prefer it Dsmash anyways =P