Why bother with an Android unit?
That money is so close to the RNS315 DAB (or in excess of the RNS315 that's for sale on here currently), that why would you bother with some cheap Chinese radio? Fair enough if it turns out significantly cheaper, or if there is some android feature you couldn't possibly live without. But the RNS 315 DAB gives you everything you need realistically. Nav, BT, DAB etc...