I bought a Boss to replace my Cabrinha Revolver 11, but the wind gods have mocked me and I haven't had an opportunity to fly it yet - damn you wind gods!

I ride the Smoke (9m) and absolutley love it. It's really grunty at the bottom end, and has good top end (I've had it out in 30 knots and I weigh around 90kg and didn't feel like I was going to die). It can be tuned in heaps of different ways, you can even run it without a bridle if you want.
Price-wise, they're not too bad, they sit in the lower end of the middle of the price range (if that makes any sense...). They're designed to use the same bar on the 6.5, 9 and 12 (not sure about the new 5 and 15) so you can save cash by only getting one bar.
The new 5m, the Bunny, looks awesome, but I couldn't justify getting a 5m, but maybe the missus needs a high wind kite