Cool. About 80% or so of the functionality is free, you have to upgrade to Gold for more advanced things like the File monitor (if you regularly edit tags, rename or move files, etc. from within a different app) or if you want to run some VB scripts on the database (that's pretty powerful).
The forum (link on their main webpage) is also very helpful. I manage just over 5000 songs and swap out playlists for synchronizing with my iPod (using EphPod) on a regular basis.
Glad to help.