This is awesome news. I signed up for Google Play all access when it was beta a few years back, so I'm locked in at the $7.99 per month price.
I'd say that Google Play Music surpasses iTunes and Apples Match service in every single category except for integration into the Apple ecosystem(I can't play my music using my Apple TV). That being said, I picked up a Chromecast for $28 which does all of the things that I can't do from my Apple TV, and I found a used Nexus Player that does some additional things that are pretty neat.
I'd say that Google Play Music surpasses iTunes and Apples Match service in every single category except for integration into the Apple ecosystem(I can't play my music using my Apple TV). That being said, I picked up a Chromecast for $28 which does all of the things that I can't do from my Apple TV, and I found a used Nexus Player that does some additional things that are pretty neat.