To be fair, I think that the Vision is a different kind of ride. A more mellow, more stretched out (it is much roomier than a Wing) ride that should be compared to the Harley Eglide.
I think the Eglide is the exact market they were trying to go after. Features, and riding position and whatnot. The wing I guess would be best compared with the bmw LT (maybe the new bmw 1600?).
Overall though, if you ride more sporty, you're probably much better off with a goldwing. The vision suits my commuting much better than I think a goldwing would do, backseat comfort for a passenger I'd say is about equal, and I can have more fun on the vision and lean more than your "typical" cruiser (Eglide, Star motorcycle, etc), but probably not corner as fast as a goldwing or bmw.
But don't worry about the slowspeed handling. No issues here with it. And if your feet slip for some reason (gravel, or you get surprised by a car and grab that front brake while in a slow turn

), the tip-over guards work GREAT! To the point where it will support the bike AND you on it so you can literally stay seated while it's on the tipover guards and get off at your leisure.
Alexi
FWIW, if I had the cash and I was a little taller, I would have gotten the goldwing. However the vision does everything I need it to do with just as much comfort, is lower to the ground so I can reach easier (30" inseam), and I HATE having to look through a windshield, so an electric windshield is damned near a dealbreaker for me.