I've never used it. But I did think about it since it had MP3's available and not WMA's.
I won't buy music from anywhere that uses DRM files like WMA's. I like my DRM-free MP3 files. I have paid a couple of pence to stream the music however... You know, JUST to listen to once...
I also won't buy another CD since I was ripped off with the last one I bought - it wouldn't play in my PC without installing the player on the disc, and then it played back at 24Kbits, so sounded only marginally better than if it was played over the phone.