Google has one dealbreaker problem: it ANNIHILATES data on cell. If you pull up a playlist or an album it starts caching the entire thing. This is a slight problem when I'm at the gym and bouncing between stuff because within 2 minutes I've used up 100mb of data.
Used it on my iPhone and literally a minute into the first song on a playlist I'd burned up 40mb. Absurd.
I see. I have unlimited 4G with Sprint and 50MBPS Comcast at home. I'd just save for offline use if data is a problem. That caching then can actually be a pro for some. Good to note though.