I've had R2R's in my system since I was a teenager. I currently own a Revox B77 (vintage). It was refurbished by Curt Palmer (Reel to Reel Tech). Great guy and one of the best at R2R refurbishing. Buy one of his decks and you won't be sorry.
In terms of SQ,Not quite there with my DCS Bartok or my almost fully upgraded LP 12, but I have 50 or so reels of tape of out of print or live recorded music that I can't replace. Listening to those tapes through my Revox is a pleasant experience for sure.