I owned the 605P TV for about 7 months and watched plenty of streaming movies, cable TV and played Xbox x HDR games on it. Yesterday I pulled the trigger on the R615. (Wanted to hold out for 2018 Vizio P reviews but with using this for gaming quite a bit, I trust the low input lag of TCL)
Anyway, Fired up this 615 puppy last night and tried DV Vudu/Netflix streams, cable TV 1080p, HDR Amazon, and many Xbox x enhanced games.
All I can say is wow... Definitely worth the upgrade. Better colors, contrast, HDR and most importantly it does not dim the entire screen as the 605p does when using Local Dimming. It actually increases the highlights while darkening dark areas. Disclaimer I sit 6' away directly in front, in a dimmly lit room with backlighting. Off angle viewing is about the same and if you have never had a 4k HDR tv then I'd say you would be just as happy with the 605p. But if in budget and available R615 is worth it. Got my P up for sale already so I was sold on the update within 15 minutes