Essentially the Vee stayed pretty much the same throughout it's life. The most obvious difference on the early ones was the screen and it's mountings which changed in 2004 (I think) for one which has three mounting positions. Another change at the around that time was a new engine management ECU. If the bike has been regularly serviced, well looked after and everything is working OK then you shouldn't have any problems. The engine and transmission is very strong and is capable of very high mileages with very few problems. One thing to listen for is a noisy clutch at tickover which goes away when you pull the clutch in. This is a well known issue and it's quite likely that it has been rectified already on a bike of this age. This noise is more of an irritation and very rarely causes any problems. Also have a look at the paint on the engine, in particular the clutch cover and water pump. Corrosion is common but can be fixed fairly easily with a little work. Frame, forks and cycle parts are generally problem free but have a good look for corrosion on the things like fork stancions under the fairing and wheels. The brakes at best are only adequate and can suffer from tightness and seizing of the pistons and caliper sliders. All easily fixable but if needed a useful haggling point when negotiating the sale. Try to get a test ride and make sure it all runs OK. Vees tend to be bit lumpy at low revs chugging around town, but should be quite manageable. Any low end popping through the exhausts or spitting back can indicate problems which can usually be fixed fairly easily- more haggling... On standard gearing, top gear is really an overdrive and not really usable below about 60-70mph. Many owners gear it down a bit which makes the bike much better. All service parts, both genuine and pattern are readily available at sensible prices and there is a good range of tyres available. All in all an excellent bike for doing pretty much anything on.