I was daft enough to buy a brand new K100LT, back in 1989 (G reg, from Sawbridgeworth).
IMHO, they are characterless, horribly vibey, they age badly, and did I mention dull..?
Also, my knees 'interacted' with the fairing, and the seat doesn't let you shift your position.
At 'cruising speed' the tank range is hopeless, maybe 160 miles..?
In hot weather (like the south of France), the tank will burn your legs, literally.
And god help you if it so much as gets knocked off its stand, let alone dropped.
Re. the one on eBay: the 'Seller' couldn't even be bothered to clean the rust off the tools.
Not a good sign
Still... each to their own!