I personally really like the flask design, of course its more playful than professional looking, music should be enjoyable. Assuming good quality, I think the leather exterior would be much more pleasing to the touch than a characterless plastic cube, more intimate.
The streaming sounds awesome, but as others have said, the lack of expandable storage is a deal breaker for me. I mean, its an android device right? Isn't that why we buy android devices? Because we like the freedom to customize our gear? Because we want to listen to what we want, when we want, how we want? I do not support Apple, I don't use their software or hardware, and would hope that other companies shy away from their business model of overpriced mandatory factory additions and proprietary nonsense.
With expansion slots this product is looking TOO good to say no to, but without it.... I don't know.... Tough sell IMO