I think no one has had a chance to ride the 650, but I owned a Vulcan 900 Classic...
It was a POS. It only has 48hp and it is geared very low, so it feels very torquey and it can take off pretty fast from a stop light. But it is geared to do 50mph, 60mph tops, try to go faster and the thing starts vibrating like a paint shaker. Cruising at 75-80mph downright sucks.
Even though it was made in Japan, mine had appalling build quality. Several rust spots in the frame, triple trees had surface rust as they were porous and the paint/primer didn't cover it very well, the clear coat on the forks peeled away, and the only thing made out of metal on that bike is the tank. Everything else is painted plastic or fake chrome plastic. Obviously, when you have that much thin plastic, some parts will require some bracing, so the rear fender has a frame under it... And it broke. Vinyl on the seat started tearing at the stitches, gas gauge is wildly inaccurate, etc.
It looks pretty, the specs are good (SOHC, 4V per cylinder, hydraulic cam chain tensioner, belt drive) and that is why I bought it. It's the only bike I truly hated.
Comfort is subjective, I've done 800 mile days on my Versys with the stock seat. I struggled to do 200 miles a day on the VN900.