I think I will be making the final decision after I have a look at the App, I'm really interested in the Poly, but the app better have a very good layout and GUI, and it must be responsive. I'm hoping its available soon on the App Store so we can check it out before we purchase the Poly. As for the 3G/4G issue, I think it'll be fairly easy using a mobile hotspot. I usually use a mobile hotspot to steam content on to my Chromecast (without any other external wifi device) so I don't see how poly would be any different. Poly as a product, Really makes a lot of sense for me, Instead of stacking devices together and ending up with a bulky difficult to carry combo(which I am using currently), or Going for a DAP which won't sound as good as the mojo (Fiio X5iii) I'd rather get the Poly and retain the sound signature and detail of the mojo.