I had an R75/5 and R90/S. They were OK, reasonably well made, but the engineering was very Tutonic with the typical German 'move shims from one side to the other' adjustments and such. The seating position was rather less than ideal for me, and I had to be careful not to climb on too fast or the sudden change in altitude would give me an earache.
The sidestands were worthless, and the forklocks were specially designed to break off the key if you didn't hold the fork from turning untill you removed it.
