Only the original GR07 needed burn-in; I don't think the MKII needs burn-in (or as much as the original) to fix the "sibilance issue" that came with the original based on what I've read here. I still have the original GR07s and I remember they were a lot more sibilant straight out of its packaging. Now, they only point out sibilance that's already in the recording itself. 
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VSONIC GR07 Impressions & Appreciation Thread - Page 312
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