Anyone else have a hard time seeing crescendo with her arcade skin? It seems smaller and harder to notice but it might just be me

Kind of...
Still manage though...

i can see it just fine

The difference is it being in the air, and on the ground. I think it's a bit harder to see, but I don't think it makes that big of a difference.

Its probably because the lines actually show the hitbox. I always thought that for some reason crescendo had a larger appearance then the original hitbox for some reason

Its definately harder to notice.

It's a lot narrower than base Sona's ult, but that's because it much more accurately reflects the spell's AoE. If the effect touches you...

YOU DANCE.

...Except in perhaps the more ambiguous cases at the very very end of the projectile when the arrows fade out. In comparison, base Sona's Crescendo is like 50% wider in either direction than the actual AoE. Coincidentally, having a cascade of defined, hard-edged arrows flying across the ground is considerably more 'noisy' than her base effect, though by its grounded nature, champions and obstacles can obscure the visual. I did my best to strike a visual balance and, admittedly, may have been a bit too conservative. We'll keep an eye on it, but I think it'll help once the audio's volume is kicked up a notch or two.

its harder to see in team fight with people standing over it.
but at least its dance-dance revaloution.

Definitely hard to see in a fight. I think it's not bright enough and too see through. Kinda mixes in with a group of people.

I think you should add elements of the stomp pad if you get hit by the ult. If your dancing you should be on top of a game pad jumping around like you see in the videos of DDR.