John, it appears that the upgraded model appeared here in 2004. Mine was built in July. As for the vibration, it is not under power or under brakes. It appears when I ride over any slight uneven surface. Even a cateye can produce the vibration. As stated, it is really evident in the foot pegs. I have only had it 5 days, but have already put 500+ k,s on it. Maybe I am being parenoid and need to let me and the bike get to know each other better.
I will take on board the muffler comment. That is the sort of issue I was thinking about. The bike had been idle for a number of months before I purchased it and it would appear that the last owner was not a regular rider. I however cannot wait to get back out there.
Great forum by the way. Have been watching and learning for some months prior to my purchase.