As to price, you get what you pay for. Mine is basically standard. Heated grips is about it. Lights, tank, fairing, bash plate, hand guards, rear rack, hi-po engine, wide steel footpegs, comfort seat, alloy fat bars, decent suspension, decent brakes all standard. Plus it was designed to all work together.
1. Vibration is completely and utterly subjective. I don't mind the 640 at all. Some people can't stand it. Inline jap 4s are buzzy and horrible to me. "Smooth" bmw boxers are lumpy, rattly and horrible to me. Some examples are worse than others. I've heard reports of blurry vision and chattering teeth, sounds extreme but none I've ridden are anyhing at all like that. I did ride a 400MXC that was just like that at 110km/h in top, smoothed out again by 130 though. There are various things you can do to reduce the vibes if it bothers you just a little, being jetted correctly is one of them. Mine's not been touched, and I can't even be bothered reinstalling the rubber footpeg tops for long road rides anymore.
2. Seat is fine. I've done 3x Rusty Nuts Grand Challenges (1000km in 24 hours) of which the first I used a sheepy, the latter two nada. I've ridden between AKL & NSN several times. I get there pretty knacked because I've taken every possible gravel road that vagely gets me in my intended direction. OK, so I did take some "long cuts", my bad.
3. About the only issue of concern is that pre-2003 the output shaft bearing behind the clutch was a ball bearing. That was prone to failure, so a warranty upgrade to a roller bearing was offered, retrofittable to all years. 2003-on it was standard. Costs around $100 if you install it yourself. Also 2003-on have the high-flow head. Lots more info on the bike in the advrider.com
KTM LC4 (640) Index Thread.
The bike does not like motorways, that's when you'll notice it is a thumper. You'll be bored shitless (that bowel thing again!

), and the vibes will get to you because you'll be sitting still and not concentrating on much else. Stick to the back roads if at all possible. Sure it would be nice to have a really comfortable bike for the occasional motorway sections, but then you'd have to put up with it being a pig on all the gnarly fun stuff.
As is, fully optioned up, it is basically the same weight as an unimproved DR650. Less if you remove the second front disc & calliper. Plus it makes 25% more power. With all the Euro 2 emissions gear on them standard they are tamer than you might expect, but some basic tuning mods will really wake them up apparently.
Also consider an LC4 Enduro with 18L tank and comfort seat. Damn near the same bike - main difference being the fairing & lights - for less money, and many more of them around. Slightly lower seat than the tall Adventure, too.
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