I bought this software recently, so I've only been using it for a couple of weeks, but so far it offers a unique set of features that no other software offers and it's a great companion to iTunes. I have used several other taggers and tools (TuneTagger, Tune Ranger, Jaikoz, iTunify and -- more recently -- Karatunes) with varied experiences. What I really love about TuneUp is the extra information it provides about bands/musicians and related albums. It doesn't do a great job of fixing tags and artwork, but Jaikoz does a decent job of that and it did catch some files that Jaikoz didn't (and vice versa). I consider TuneUp a very valuable addition to my set of tools.