Hi James01,
You surely tried the Boss in higher winds and all sorts of conditions by now. I am thinking of buying one, but there is no demo to try in WA at the moment. Yesterday I asked a bloke on the beach to try his older model Boss in marginal conditions (15-18kts) and I could not stay upwind (I am 100kg on 135x44 board). The kite back stalled a lot - perhaps the lines were out of tune, or they were set to 'light wind' setting. Turning speed did not seem much different than my 2013 Switchblade (12m as well). The low end of my SB seem better as well in the same conditions - to be fair, I changed to much bigger board (North Spike 153 x 46) but had no problem with back stalling and was able not only to stay upwind, I was riding upwind

I own 2015 Smoke, which I demo, loved, and bought. I kept on dreaming about the Boss, hoping it would be similar to Smoke but my short try at the beach yesterday did not live to my expectations. I tried my Smoke in the past on 'light wind' setting and did not like it much ( easy back stalling) but it rocks on its standard setting (I have not try it on 'high wind' setting yet).
Could you comment some more on your Boss if you had a chance to try it under many other conditions?
Perhaps anyone who owned older and now has 2015 Boss could compare the two - do they feel much different? (Low end, turning speed, issues in back stalling?)
Cheers
Swavek