Xolox doesn't seem to be much better than QTrax. In fact it has one of the most aggressive search algorithms after QTrax and Mutella.

Although they have tuned down their requery frequency with v1.5, it's far from being ideal.

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Morgens ess ich Cornflakes und abends ess ich Brot
Und wenn ich lang genug gelebt hab, dann sterb ich und bin tot

--Fischmob