The best Sonic mod I've seen in a while, I never turn this off. I don't know if there's some conflict with other mods (like character select or character select plus) but Amy's hammer never bounces off of walls and the twirl/spin has a chance of also not bouncing off of walls. Sonic's moves all work unless some qol or moveset replaces what Z+B does, of course.
The voices sound pretty close to the original voices these characters had early on, during their first few 3D games and early cartoons (for Sonic, at least). And the animations are great, they play different enough that beating some regular levels can be just as fun as figuring things out for the first time.
If anyone is reading and has not downloaded this mod yet, you should do it right now and NEVER turn it off, it's just the best Sonic mod you'll find.
I'd love to see your take on Knuckles, Tails and even Robotnik. Cheers!