Yeah, I certainly wouldn't stream FLAC files over 3g/4g.  Wifi only.  But that is still a huge plus since free wifi is pretty widely available when traveling.

Agree on the services-oriented strategy for cloud storage by vendors like Google.   That said, I've uploaded hundreds of albums to Google Music in lossless flac format and, while far from a perfect solution, it has been fantastic to be able to access my music from anywhere with wifi with cd...