THUNDER82 Jaikoz is the best tag editor out there. I have tried many others including SongGenie/Coverscout, and Jaikoz is still the software that I find myself using the most. It has been 100% stable for me, even when i throw a few hundred songs at it. Those mentioning that SongGenie & Coverscout are better obviously don't need their software to do much. Sure these other programs have a nice interface (honestly, much nicer than Jaikoz) but their functionality is SO limited. Given the price tag (especially compared to the Equinux equivalents) Jaikoz is awesome.
The only improvements I'd like to see, would be a more "fluid" interface for OSX users and better handling of song lyrics. Pulling lyrics from the web is awesome, but I don't feel I'm able to properly manipulate the lyrics field. Being able to create paragraphs and separate the chorus from the rest of the song is important to me. Also, it would be amazing if there were an option to automatically delete the web link that gets added to the beginning of the lyrics added to each track.
Overall, Jaikoz is extremely feature rich and very stable. I'm very happy with my purchase.
(Version 3.2.2)