Great with conventional rhythms, not so great with others.

Works as advertised for music that is in a conventional Western 2/2 or 4/4 meter, but definitely has consistent and significant problems figuring out the tempo of some 6/8, 3/4, or more complex rhythms, anywhere from 30-50% off the actual BPM, not merely a double-time error. It does indeed run remarkably fast on bulk quantities of tracks, saving its results into your iTunes library instantly.

Radfaenger about BeatGauge, v1.0.3