I, for one, am looking very forward to this service. I have a Mac to use it on, but don't manage my music collection on it.
The fact a legitimate company is backing this, has the marketing cash to promote it, will bode well for it.
I used Kazaa for a while, but it's confusing for the normal user. Not to mention the quality is always questionable and viruses are often tagged on to the files. You have no idea who made the file. It's a quasi-black market system.
With the Apple system, you know the quality is excellent, downloads will be swift, and you aren't at any kind of risk.
And bottomline, you are doing it the right way.
For $1/song, it's the way to go. Looking forward to trying it out!