I've ridden the B1, B2 and B3... all great skis, but not so good for park as previously mentioned. It does have a bit of an upturned tail so you can ski switch, but doesn't feel quite right riding the Bandit skis switch.
It's a half-twin. Thats all you need really. I learned how to do 180's on complete flatback skis and it never made a difference in the park. I'd rather have a ski that skied well instead of one that skied poorly but had a full twin
squads have a 1/4 twin (at least the kid I was riding with today had them because the topic of flatbacks came up, but he skis for rossi so I think they are next years), my skis are completely flatback, so annoying sometimes.