I've soured on the factory hard side cases. They are excellent for what they are. Very quick and convenient to mount/dismount them from the bike. That makes them perfect if you have to take them off to stow the bike in your garage. The clamshell design works well, and they hold a good volume of stuff. But the bad part is the shape. They don't hold rectangular objects well. Things like a briefcase or shoulder bag don't fit. For commuting I have to take the tablet out of my soft shoulder bag to get it to fit. My soft insulated lunch bag has to be mashed in.
Though they advertise the luggage as fitting a full faced helmet, my HJC brand full face helmet does not fit.
The handguards are a nice feature in cold weather. With winter gloves and the handguards I have no problems riding even down to freezing temps, at least for a half hour. There are aftermarket handguards which may be cheaper and which folks here like as much or more than factory units.
If you're going to ride off pavement, look into a radiator guard as well as good engine crash bars. Note, too, that the front turn signals hit the pavement if you tip over, which cracks expensive plastic fairings. I replaced mine with smaller LED units which are brighter and won't touch in a tip over.
Factory tires are ok, not great. For highway or wet weather riding there are some excellent alternatives. For dirt or trail riding you definitely will want to replace tires.
Many owners replace the windshield due to turbulence at highway speeds. I've put on a Madstad which has eliminated all helmet buffet on the highway.
For the price the V650 is an outstanding bike. There are no significant problems, just personal preferences which may lead you to some minor mods.