I am right now. I think it works very well. I halved noticed a couple of quirks though:
1. There is a slight delay when you start typing after a break. Probably the Bluetooth connection firing up after being idle to conserve power.
2. There are times where short cuts simply do not work. CMD+Space, Shift+CMD+H both only work about 75% of the time for me. Quickly turning the keyboard off and turning it back on usually fixes it.
Has anyone else had any issues with #2? I'm not sure if that's a BT Keyboard thing or if it's an iOS 9.2 bug.