I have had the BMW since the late summer of 2019 (or was it 2018?) and she has been really good. She came pretty much as you see her but I have done a bit of engine work (re-torqued the heads, replaced on rocker arm pivot bearing, reset the valves etc.), installed a set of new tires and a new battery plus a headlight modulator (I know some people hate them - but I would never ride without one). At the monet she has about 110,000 km (around 70,000 miles) on her but that is nothing for these old airheads.
She hasn't missed a beat until about two weeks ago when suddenly she wouldn't turn over when I pushed the button. It turned out to be a starter relay. I fixed that and on the recent Northern Ontario trip she literally didn't miss a beat, despite temps in the mid-30 deg. F range at night and a lot of rain on the road. Actually, I think that she felt smoother than my 2007 ST1300 - and was even quieter. Now, there isn't nearly as much power (70 HP versus about 125 HP on the Honda) and I do not have ABS - but she weighs 230 lbs less than the ST, she has shaft drive, decent brakes and electronic ignition.
She'll do 200 km/hr all day (I am told....) and she is a steady and smooth handler with a comfy riding position, decent lights and nice controls (except for the sidestand issues noted earlier). The rain protection is not as good as on an ST - but it is waaaay better than you might imagine. I rode nearly 500 km in solid rain all day on Wednesday and only cuffs of my pants got wet. Passing on highways is easy and I seldom downshift as the BMW has good torque at moderate speeds.
BTW - BMW never made a proper top-box for the RS bikes back then and the stock tail rack is sort of ridiculously tiny, so luggage capacity is pretty limited by modern standards. Soooo, I found a reasonable top-box at a cycle wrecking yard for about $30 off a 1983 <I think> Honda GL1100. It fits on the stock mini-rack on the dual seat and one of my students 3D printed the mounting brackets for me. I only use it for my rain suit and some bungees and as a place to stow my jacket when I go into a restaurant etc. - and it works fine. I even managed to get a set of keys made for the original Honda locks and the thing seals up dry as a bone in the rain.
Pete