I picked up my '05 VN750 off of Ebay back in '06, and it's been a good bike, for the most part.
Check for battery "vomit" underneath the bike's battery box. The bike's regulator/rectifier sits there, and its wiring (or the frame, and/or paint) may have been attacked by a battery spill.
The ACCT's on my bike went out at just over 9k miles. If you replace them with the available MCCT's, this will solve this problem.
The rear spline lube had been done at the factory, but the redo certainly didn't hurt. I would strongly recommend you look into this and have it done very soon, if you buy the bike.
The clutch "chatter" only occurs when the bike is cold, and goes away when the powertrain gets hot; otherwise, it is really harmless.
It's interesting to me that you are obviously a "Harley" guy but you find the VN750 inviting. These bikes are worlds apart in terms of design and personality. With the Vulcan, the engine really doesn't hit its main stride until about 4-5k on the tach (and pulls hard thereafter), where most other cruisers are running out of breath. These motors truly have a high-rpm design to them, so keep that in mind as you consider it.
A maintenance-free battery is truly a godsend to bikes like these, for multiple reasons. I (also) recommend that you replace the bike's battery with one, if it doesn't have it already. When replacement time comes, consider using iridium-tipped spark plugs to make starting easier, and plug replacement a thing of the past.
Unlike most Harleys and bullet bikes, these Vulcans are not on the radar of most bike thieves, so you should have a positive experience there with this bike.
NOTE: The aftermarket world has basically all but forgotten that this bike exists, so if you want to later add accessories you'll have to think "outside the box" most of the time and use some real creativity. Fortunately, a lot of that has already been done on this forum.
Also: if you park the bike out of the weather (i.e., where humidity is controlled or eliminated), and keep it waxed and/or polished, it will stay good-looking for a long time. Otherwise, these bikes rust fairly quickly--especially in certain places.
If you buy the bike, relocate the regulator/rectifier as described elsewhere on this forum--especially if you use the bike consistently as a commuter.
Do a search for "phantom gas syndrome" on this forum, and know what to do if/when it happens. It's a relatively easy problem to solve.
Lots of really good info and people on this forum. Stick around....
Atlanta commutes can be really nasty, even on 4 wheels. BE CARE-FUL!!!!....