It is quite an interesting device. My LG TV works quite similar with Youtube and Netflix, I've been using it quite abit, I get the little cast icon in Youtube and Netflix and just watch it straight on the TV.
If (When?) developers get their hands on the SDK and allow local content to be streamed to the device as well as DLNA hosted content too, it could be very interesting assuming it is able to play 1080p with DTS.
And at $35 (whatever the UK price turns out to be) it'll be quite a steal and highly recommend by me, especially to 'not to technically minded' friends.