Full of very useful and unquestionably positive changes. Very handy menu allows you to customize the extent to which the addon affects your experience, and it's more extensive than you'd first imagine. Recurl makes springs a lot less obnoxious to use and lots of small customizations like sound effects from the classic games.
My one current gripe is that, while there are configs for controls on some new mechanics like recurl or tails flight cancel, these keybind options are limited. For mechanics like the recurl, this can be especially problematic for custom characters where both jump and spin keys do distinct air actions and going into curl during these actions can be jarring. However, I still love all the features included as standalone enhancements.