I don't want to sound skeptical (I like the device and consider buying it), but how likely is it they gradually introduce "Windows (Phone) only" features for this device, up to the point it's not so useful in other platforms?
It also depends on how much the other platforms support deep integration. For example Apple tends to lock down things like Siri(perhaps this can connect as a bluetooth mic) and Google had scuffles over Youtube on Windows Phone so is likely to do everything in it's power to undermine this.
EDIT: clarification