I owned a 1974 R90/6 for about 10 years. It had hard bags and a Vetter fairing. I didn't really care for the fairing. This past October, we were on the Blueridge Parkway and ran into a fellow from Ohio -- I think it was Ohio -- on an R90/6. He had 450,000+ miles on the odometer and likes the bike very much.
I'm not interested in having more than one motorcycle at a time and I am very happy with my Bonneville T100, but I probably wouldn't pass up a nice R90.