I found little in AACHoo that is any better than iTunes. It lacks the ability to look up track info, and if converting from an mp3, it cannot tranfer the info tags.

As for converting from mp3 to AAC, I've found that the result of compressing an mp3 is practically unlistenable. As others have commented, it may be fine for spoken word recordings, or for those blowhards on the radio & TV. But the podcasts I download from AAR are all low bitrate anyways.

AACHoo is a bit limited for $15, considering that iTunes does the same thing, but better because it preserves id tags or looks them up. I suppose if you dig entering song info by hand, then AACHoo is for you. Otherwise, save you money and stick with iTunes.