I don't really think I like Britney's version much at all. That's just how I feel, but if others like it that's good for them. I know it's just a demo, but it seems a bit busy with some of the background vocals. A lot of people are going crazy and talking about how amazing it is, but I must be missing something. I'd be interested in hearing a final mastered version, though we'll probably never get one. Are we even sure this is Britney....? It doesn't really sound that much like her at parts and the vocals are layered with a lot of effects so it's hard to make out.