Please don't let the new paint jobs and shiny chrome fool you.  These are junk - unsafe at any speed.  These are scooters (usually 1960s VBBs, Supers, or Sprints) that have been pulled off the streets after 40 years of hard use, sandblasted, and crammed full of Indian components that really don't fit in the frame very well.  You will hear the argument that this is basically the Genuine Scooter Company Stella (a fine scooter) in an old chassis.  This is not the case.  These are filled with components they were not designed for.  They are normally 10 inch conversions of scooters built for 8 inch wheels.  This requires cutting the front fork and welding it back together.  This causes severe handling problems, and causes the scooter to look like it is "on stilts" and generally out of proportion.  I had the misfortune of buying on of these (a 1964 VBB) and here are the problems I came across.

1.  Engine side cowling is secured by an inferior latch and fell off on the road on several occasions.
2.  Electric starter had a shorting problem and often tried to start the engine when already running. 
3.  Choke cable would stick (in both positions) 
4.  Kick starter jammed requiring serious engine disassembly. 
5.  Wrong electrical wiring harness was installed (6 volt rather than 12) causing headlight to be intermittant and causing taillights to burn out. 
6.  Short in kill switch resulted in being stranded on side of road. 
7.  Tires are very low quality, very slick with dry-rotted sidewalls. 
8.  Tubes were old and dry-rotted.  9.  Scooter was very unstable on centerstand due to 10 inch conversion. 
9.  Grips were wrong size for handlebars and had to be secured with epoxy. 
10.  Floorstrips were secured with very poor quality hardware, causing them to be torn out after just a few rides.

I paid $3400 for this great looking scooter, and within a year had to sell it for only $1500 (giving a very FULL disclosure of its troubles)  PLEASE - do not go this route.  Look for a scooter in need of restoration here on eBay or look into scoot.net for classified ads.  Vintage scooters are a great hobby - I now have a 1963 Allstate and a 1971 Primavera, both purchased unrestored on eBay.  I am not a serious mechanic, but was able to get both of them running reliably for under $500 each.  Best of luck, and AVOID VIETNAM!