Literally everything feels better. Q feels right when you hit a skillshot and do more dmg, as oppose to before of just spamming it. I like the fact I can W someone then wait for a charm if I want to, or just slow them immediately. E feels cool to jump onto someone if they're little out of range. But the R... holy shitter, it feels amazing to kill someone with it then snap back, so satisfying. Or an awesome thing is to use it as a gapcloser, feels like you're really doing something other than smashing QEQEQQEQ like before.
I also like the fact when you're invisible, all the sounds around you are muffled. Gives that amazing feeling, like you're actually stealthed and waiting for your prey.
All in all, amazing job rito gumes!