I have Forte 7 Premium which has MIDI and PRV. I haven't used that feature yet, so can't comment on how it might compare. I also have Notion, so could use the cross-grade price of $129. I like the side panels vs. Forte's floating windows, but that alone hardly justifies the spend.
I read on another forum that Overture was "back", but didn't know exactly what was meant by that. My guess is that v4 was out there for a LONG time, and is just now being upgraded to v5.
Looking forward to real user feedback to see if it's worth $129 to me.