Firstly let me get something off my chest... Better off with the F650? Are you serious or delirious? They are completely different bikes: the KTM 640 is a civilised dirt bike, the BMW 650 is a dressed-up street bike. Check the action pictures in each review before you disagree! So it really depends on your intended usage. btw the 158kg is weight without fuel, so it is 20kg lighter than the F650, more powerful, and real-world testing shows it has a much stronger top end than their close top speed figures might suggest. For the record: twice, a good few years apart, I test rode different generation F650s but with much deliberation I bought something lighter, cheaper and more dirt capable.
The vibes are nowhere near as bad as you report, but some are worse than others. Mine's somewhere in the middle but that doesn't stop me doing 1000km days. That cost the engine one star rating.
Ride and handling with the correct springs is sublime for something so versatile. Braking was and is excellent without the overkill second disc added in 2004; in fact the inertia from that disc noticeably slows the bike's flickability so just get rid of it. The screen I think is a beaut! It's no full-monty tourer but then it's not supposed to be. It does a heck of a lot of work keeping wind pressure and weather off you at all speeds. Try standing up on the pegs above 80 mph if you really think the screen is useless, I guarantee you'll change your mind.
Mine has had a few minor mechanical niggles (all well-enough known to be sorted with help from the interweb) but no show-stoppers. It'd have to be perfect to get 5 stars.
Value... the cheaper KTM 640 Enduro with optional large tank and comfort seat is possibly better value. But the Adventure comes fitted standard with large tank, fairing, decent headlights, comfort seat, hand guards, bash plate, rear rack and power socket. All of which has been useful and faultless, so 5 stars for equipment. I don't know of any other bike that has all those as standard equipment.
Overall, 5 stars. This bike is incredibly fit for purpose. Mine gets used for everything from long-distance touring to off-road racing. A couple of years ago I looked hard at replacing it, but found there is no single bike on the market today that will match it. 50,000 km of hard use and counting... love it!
