Hi Nectar
I upgraded to Studio and it is definitely worth it, I find that having all tools available is satisfying, and I have used some of the Studio only features occasionally, not often, but if they ain't there one can't use them.
I haven't used the chord note edit, but i might....
My advice would be to watch a couple of videos and then decide, I use it mainly for vocals and shifting HVox about, but just ensure they are super clean and that you have a lot of Melodyne buffer space, otherwise audio artefacts can creep in. Tech support from Melodyne is superb.
Good luck and let me know what you decide.
cpm