Really, only odd people like them, I think. Some people put a ton of money in them and race in AHRMA, but a decent Gold Star is still going to be a better racer. There's really nothing you can do to make them fast- unless you just about re-make the whole engine; 600 bore and piston, high output oil pump, polish and port the heads, better piston, rod, crank, bearings, etc.
The interim models (AVL) have E-start, but they need to be carefully taken care of. Ever heard of a "sprag"? The new EFI models seem to be faster (70mph) and much more dependable / less to fettle. Some people love them, and the ones who don't let them sit in the garage and then sell them on eBay :
;D
Here in the Blue Ridge Mountains, I like mine a lot. The SR500 I couldn't start and was afraid to ride because of that. The GB500 is a purpose-built bike and it's about 3/4 size- I'd get cramps after 30 or 40 miles. (Both are much better bikes, really) So- with rear-sets and superbike bars, mine fits pretty good. Handles well in the twisties where I average 35 to 45mph anyway. I can do 60-65 on the freeway for a while.
The importer (CMW) sponsors a pretty good forum, so a fair amount of help is available, too. WARNING: Filters and gaskets are too expensive!!!