I had an 86 Tenere - the infamous 1VJ - Loved it enormously, but stolen. That bike was the reason I am getting the new Tenere. Been sitting on the decision for a while, but now bitten bullet.

The new Tenere is a completely different bike, but I wouldnt sell an old Tenere to buy the new one, it really isnt �4000 better.
But that said, its considerably more reliable (big picture, Yes, there were one or two teething issues) but it will cost less in maintaining, short and long term.

The XTZ 660Z Tenere is heavier, considerably higher, faster, and considerably smoother. Its also less comfortable with its dual seat. Definitely better on the motorway than my old bike, especially with the high guard. Its also much better at very low speed 1st gear slipping the clutch (dunno why but its so well balanced).

The new Tenere's water cooled not air cooled, there's pro's and cons, ultimately the engine should suffer less through consistent temperature. But water cooling weighs more and its just another thing that can go wrong.

The Old Tenere bench seat was an absolute delight, wide and long, whereas the new seat encourages you to remain in one position. After about 60 miles I do want to start wiggling around and the new bike doesnt make it easy.

The new Tenere is simply a better all around bike, But theres something about the Old Tenere that is and always will be amazing, I think that this is what you are referring to in the description of it being a thumper, this has been filtered down from the original XT600 kick start only with the 30l tank. I'm not sure that the "Thumper" characteristic has fully carried across to the water cooled engines.