Leven Valley 2 Day was won by Steve Robson on a Montesa and a very original one was being ridden very well by Craig Turpie this year. You might be surprised how good they are 😎
Not 100% accurate, unless you buy something really obscure, parts are easily found. Many of the twin shocks are as reliable, possibility moreso, than some modern bikes.
Look through the current topics, virtually all modern "reliable " bikes 😎