Lou beat me to it....there is a 3000 and a 4000 series.....if you choose to purchase a set, go with the 4000...Kevin is right, the upgrades were probably not done to the 3000 series
I think the price is way too high.....
my last two sets I got were Unused 5500 digital series, used in staging new homes, only a few years old, shipping braces still in place, and only paid 100/150.00 per set...