If you can find a low mileage one that hasn't been abused, you can stand the vibration and don't mind the fiddly oil changes with the oil in the frame then why not, they are light, have great suspension and have a decent range with the ~28L tank. But unless you already own one and you've ironed out their known issues (running hot, LH crank seal issue etc etc) then I would personally put my money into a different bike.
There's probably a big 640 Adventure thread on ADV rider to trawl through, which will either make you want one or put you right off!
Definitely take one for a test ride before you hand over your cash, I got annoyed with the vibrations on long rides (numb hands) and switched to the DR650, way smoother and comparatively a lot less maintenance required, but I do miss the WP suspension of the 640.
PS: If you fill in your location in your profile, we can see which market you are looking to buy a bike, which makes recommending one easier
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