I owned a 1990 for a few years. As mentioned the R/R is the weak point, the only one in my case. Swapped in an R7 R/R and never had an issue after that. It never left me stranded even after 2 R/R failures because you can always bump start it and keep revs higher to go home (to a very fried battery).
I did some long-ish distance riding and it was quite comfortable really. All was stock on the bike, except for a Yosh can. I had a backpack and a tank bag. The stock position is great, not too sporty or relaxed, you get to wear the tires with no chicken strips even riding back roads mostly.
Valve adjustment can be a PITA, have to remove half the stuff on the bike, only to find out it's really a valve check. Other maintenance is fine, single sided swingarm makes balancing the rear tire a bit tricky. Gear driven cams are a treat to the ear, and no worries of a worn out chain.
Sold it to get a Hawk GT, two less cylinders and a lot lighter because I don't ride too far/long.
Good luck.