I use iTunes and I love it. Never had a problem, it's easy drag and drop, you can reorganize in a bajillion different ways, and the iTunes database (CDDB) for automatically filling in CD information boggles the mind -- they even have CMJ monthly samplers and obscure indie albums that have been out of print for 10 years.
That being said, I have no idea how it's different from musicmatch or ephpod, I don't know if there will bugs with the windows version (that seems to happen a lot when they first try a version in the different operating enviromment), etc. And I'm sure some real techie audiophiles have other issues I don't even know (or care) about.