Just to provide another update (especially since this thread is one of the few references to the XT300 online!), the XT300 isn't yet supported in the Xinfrared app in North America, so I had to work with them to get a development build of the app.
It does work quite well—I believe with a 60 Hz refresh rate, and it has a relatively narrow FOV so it's less fitting for a wide area survey, and more for specific objects / closeup identification.
It's extremely clear, the focusing adjustment is easy, and as long as they improve the software a little more, I will be very happy with it. It seems like it's meant a little more for 'tactical' use — the app has a lot of features useful for hunters (e.g. bird / animal highlighting modes, an adjustable targeting reticle overlay... things like that).
But I'll be testing it more now that I can actually get it to work. Hopefully they can release it soon so the full app works fine.