I have an XS 650, and an SV650. Probably my favorite displacement class. So many great bikes with 1,2,3,and 4 cylinders in this displacement.
On the Vulcan 500, It's basically the Ninja 500 motor with milder cams, lower rev
limit, and a tad smaller carbs. Reliable as an axe. Good beginner bike that can do freeway if need be.