Indeed, Aura Sphere charge is amazing in this game. It seems to eat people's shields up more reliably for a poke than in Brawl and cause more shieldstun too. B-reversing it into an opponent is also much more difficult to predict as the game speed has been upped from Brawl and you won't be able to escape it that easily anymore either. It has also got that extremely valuable role as a covering tool for people trying to come back from the ledge often resulting in a more or less guaranteed kill.
Too bad our nair's hitbox got severely nerfed and fair doesn't linger anymore so followups aren't so easy anymore (at least on the 3DS). The things I have usually done out of it is shield -> jc upsmash if they aren't positioned really far to the back or OoS dair (after one or two hits) -> FP/Grab if only the first hit connects. I feel these are really reliable options even if the latter one might sound goofy. Sometimes when I'm sure someone will try to jump out of it I'll just proceed to bair or uair though these obviously are purely reads. All in all, I love this move and will continue to implement it into my game as much as possible.
One thing I would like to be tested if grounded dair is actually safe on shield on higher percents as subsequent dairs have barely any time to do anything between them. I've had a situation many times where I did 3 dairs straight on the opponents shield without them managing to do anything out of it, it felt like it could be true pressure.
Also, I'm somewhat interested in our new upB if we have any somewhat reliable followups or setups to it. It's suprisingly deadly at higher percents and fast too even if the startup is a clear warning to the opponent.
...after all this talk about our moves, has someone else noticed that it's almost like that all our best moves from Brawl were nefed (all of our aerials, FP grab, jab) and the worst ones buffed (AS charge, DT, upB, FP flame, DA)? Sometimes it feels like I'm playing this game backwards when the central part of my playstyle revolves around aforementioned buffed moves lol.