I had a China belt on my GV250 fail at 1000 miles. I have had good luck so far with Gates at around $35. Gates has been making belts in the USA forever.
mjr(Mike) is repairing a Burgman650 transmission and he said the belt, which is OK, is more like a chain; it has links and is not at all like the belts on Kymcos. It has 60K miles on it! If you figure ours need replacing at 12K then $450 is not an outrageous price.