Hmmm... Not to take any sides in this argument but I did ask him specifically why he ranked his 550s a bit low... From my experience, they're not that different to the Q701s, so for instance, why the Senn Momentums would be ranked between them was a bit confusing (seen the Momentums mentioned in the most disappointing headphone thread...)
All you had to do was read the last few weeks of the his this thread. LOL
With any headphone that has a brighter sound signature, there are always going to be some people for whom the high frequencies of the particular sonic signature are going to be fatiguing. It's the nature of individual preference.