Ok, I did some mixing yesterday, and as has been reported in some of the reviews on Studiospares website, the "politeness" in the treble can lead to missing some detail in the mix. I switched to my old Sennheiser 202 cheapies, which are more bass and treble emphasised, and though the overall signal showed more distortion, it did pull out some detail on reverb on the drum overheads that I didn't like, that I had missed using the m2000s. It's almost the headphone equivalent of using ns10 monitors to check the mix vs proper studio monitors.