I did my own tests.
As you know, the output of different MP3 decoders should be the same:
I compared the WAVs produced by Fraunhofer, Feurio, Nero5.5 and Winamp2.666.
Feurio uses correct decoding routines according to the author of Feurio:
Message by Jens
Winamp lower than 2.666 used the old Nitrane decoder known to be quite poor, but 2.666 and higer are using a new decoder (Also Fraunhofer, I seem to remember).
Well, Feurio and Fraunhofer 1.9 (the codec installed by one of the Microsoft applications) outputs had exactly the same data. (Older Fraunhofer 1.2, the typical one cracked by Radium is not OK).
Nero5.5 was almost the same, except some samples that differed in the least significant bit. I don't think that makes a difference.
I think that Winamp2.666 was similar (some samples different but very few).
Anyway, I always recommend the Feurio decoder if your burning drive is supported.
Decoding to harddisk is twice faster than Nero. If there are errors/defective frames Feurio will warn you and tell you the positions of the errors. Nero won't show any warning and burning can fail or the tracks can be cut in that position.