I had my 91 850 with the 360 deg crank for 14 years and miss it. I replaced it with a 270 deg 900 and hated the power delivery. Gutless below 4k where my 850 was grunty. Voltage regulators fail on early ones fit one off an R1 or other good replacement. All the info you could need on carpetdm.com
Ok on gravel but like any road bike when it gets soft you have to gas it to get the front end light. You quickly run out of revs and skill! The gearbox is agricultural but strong. It's nice to have the valve clearance check at 24,000 mile intervals though. Also finding 18" front tyres can be a pain. People have fitted rears in reverse to get around this though.
If you find the right bike go for it.
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