This is how I roll. I'm not sure what benefit I'd get by integrating my personal library with the cloud, but I find accessing my library from multiple devices to be pretty easy by simply duplicating songs onto those devices. Nowadays most of my devices are big enough to accommodate the whole library. Sharing music with friends is also simple because pretty much everyone's phone can play an mp3 file out of the box these days. This approach might have been cumbersome when I was younger and I added to my collection more frequently, but I had fewer devices then. Not only does this strategy insulate me from the whims or obsolescence of some third party, but the defacto back up preserves my collection in the face of device loss/failure as well.