Hey man, I will go ahead and chime in.
First off, welcome to the group. great info and people here.
IMO, the Vulcan does not vibrate badly at all, quite smoothe in fact.
Yes, the mirrors are easily changed, huge variety to choose from.
Quirks, checking the electrical system is a MUST before you buy the bike. Checking the operation of the stator and reguator is vital. not super hard to do, and if the shop wants to sell the bike, they should have no problem showing you that they work.
ngk plug caps
mf agm battery
ballancer and stator replaced. (Lance328)
Pro Tac Backrest
progressive fork springs
fork seals replaced
2003 kdx 220
frp chain gude
frp skid plate
acerbix hand guards