Bought new in Japan during my Navy days. All the reviews of the day were positive. They were close, but couldn't know how great a bike the 850 truly is.
At about 7500 miles the pumpkin (?) went bad. Suzuki has an excellent record of driveline reliability so I asked my mechanic what happened. He thought it was due to poor assembly (I had it shipped from Japan and put together by a shop in San Diego that has long since been out of business). Since then it has been trouble free. The ignitor box failed in 1996. A factory replacement set me back about $400, but for as many miles as it has had to endure, and all the years it sat outside, I can't gripe.
The seat pan has rusted itself into two pieces. Sitting in the weather with a ripped seat helped it along.
The horn button broke. The little plastic button itself.
A screw holding the tac face has backed itself out and rolls around the bottom of the instrument face.
Been through a few headlight bulbs over the years. Not unexpected. But the reflective inner lining of the headlight is peeling making the light less effective.
The shim under bucket valve adjustment is not nearly as easy as the adjuster screw set up of my GS700E, but that's about as harsh as I can be concerning maintenance. Newer motorcycles have eclipsed the 850 in every measurable respect, but not one (in my opinion) has put it all together in so satisfying a way.
The 850G may not have flash, blinding speed, or brick wall braking, but it will keep you smiling like a fool long after you SHOULD have stopped riding.