have been using this as an experiment for the last couple of weeks. My main machine has always been my 15" cMBP i6 with 8gb ram, 256 gb ssd and 1tb optibay. having said that, i have been using the surface pro 3 i5 256 gb 8gb ram version, and this is one sweet piece of hardware. i think if there is anything that can challenge apple in the macbook air space, it is this device, sans its battery life comparison. stable, fast, a maturing OS and desktop friendly, with the office suite in place, this is quite a machine. the battery life alone is the deal breaker, it is like a typical windows laptop with about 3-4 hrs on heavy use as against 6-7 in my macbook.