Spiros,
I have used the software now for aproxx. 6 months, and although I still like it and do not hesitate to recommend it, I think you should also be aware that I tend to use it more and more in conjunction with iTunes and scripts from Doug (http://dougscripts.com/itunes/index.php). The Equinux software I use for generic filling of all the metadata fields whereafter I use iTunes and the scripts from Doug for fine tuning.
If your library is not that big, I would advise to give that a try first before spending money on Equinux. In general Equinux is easier to use and more automated, but does not bring that much additional functionality if you have a small library.