I just realised that, despite what we may be thinking, iTunes Match does not stream in iOS 6. I noticed this when I checked the usage portion of iPhone settings and saw that every song I played, the Music App was using more and more space - aka downloading the songs. However, when I turn off iTunes match, it deletes all those songs. I'm not sure why Apple has this new behaviour in iOS 6, and I'm pretty upset there is no real streaming. Disclaimer: this may just be my iPhone being annoying. I've restored a total of 3 times now and it still does the same thing though.