I've ridden a couple of NTV650s, but prefer my smaller, alloy framed, chain driven version.
Plus points: amazing reliability (I've completed 119,000 km on it since 1996, and have replaced: Fuel Pump, front and rear discs (the front's are very large and eventually warp, either standard or EBC). Currently running ABE front disc. Oh, and the petrol tank rusted through on the right hand side, which I repaired with putty. Rear fairing has cracks in it, which don't appear to be getting worse.
Minus points: the chain is out of line with the swing arm which makes adjusting slightly tricky, and requires a special tool. Some of the nuts and bolts are rusting a bit, but this bike is 20 years old and lives on the street. Goes onto reserve wit little warning, which can cause the occasional stall at traffic lights. Equipment a bit spartan; have added Daytona heated grips which are ace.
Handling is very good (not quite on par with my old NC30), but very precise and forgiving.
The motor is fun, and breathes through K&Ns, dynojet and Supertrapp exhaust, which gives it a rorty note and enables the bike to fire away from junctions faster than almost any other bike on my daily commute.
As a pillion bike it's a little cramped, though we made it out to the Czech republic two up in 1996.
Overall, fun bike to own, and I look forward to clocking up 100,000 miles in a couple of years.