It feels great and I am unlikely to touch another keyboard or MPE controller while I have a working Osmose, its a different experience and is the culmination of everything I ever wanted from an expressive MPE controller.
I have tried it with an OB-6 and a Waldorf Iridium and a bunch of MPE-capable softsynths. And also with an Expert Sleepers FH-2 for getting cv into eurorack. But I havent really scratched the surface with using it with any of those synths because to get the best out of it you really need to craft each patch to use it properly. eg a lot fo the expressive joy happens when your fingers become the envelopes, rather than relying on the traditional envelopes in synths.
I have had to sleep plenty since getting it otherwise I get migraines. And I have spent rather too long on the nerdy side of matters, eg studing its midi output in more detail in a midi monitor, learning about what benefits MPE+ has over normal MPE, and recently fixing the code of a VCV Rack module that can use MPE+ but was broken in that mode due to a small error in the authors code. I should really move on to the the actual sound design stage now, and far more practicing of playing it.