I have an LC4 640 and believe it is the perfect dual sport - that is; good at everything and great at nothing.
Ups:
Vibrations mellow after 1000 miles, I have no complaints.
It's a very good road bike, better than some true road bikes.
It gets a ton of looks.
It eats fast trails, lots of fun off road.
Great for 2-up riding with girl.
Good power - fast to 70mph.
Downs:
It's really not great in the tight stuff, woods, lumps, etc.
It's tall and best for 6+ footers.
Throughway driving is good, but would be better if it had a 6th gear.
Seat is hard but fine for rides under 3 hours - can be changed.
If you get it, you will ride a lot more street riding than you thought you would.