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Well worth the money.
Built in Java this one works. It has just tagged my Itunes library 4370 songs while I walk the dog. Very impressive integration with the Imac. Why the hell Apple didn't fix it all in Itunes baffles me. Still an excellent add on that works. Good documentation too.
I am now using the latest version which has some important fixes.
Pros: Uses multiple research tools. Integrates with Itunes. Fixes Artwork. You are also able to over ride the auto settings. Able to run a large folder with subfolders by batching.
Pays a royalty to Music Brainz :-)
Free upgrades for life, both big and small.
Cons: Well it does take time.. walk the dog or make a nice coffee (or lunch!) But then what do you expect.