Personally, I had the 105 Aer... And I sent it back ( as for the 109 Pro ). I also had the Meze 99 Classics ( second revision, bass cannon ) which I also sent back because of the catastrophic tone and the much too loud basses. I actually would like to try the third revision of the 99 which seems to fix a lot of muddyness in the bass region, by lowering it quite a bit.
Meze is so close to having near-perfect headphones. Comfort is excellent, ergonomics are excellent, power supply is excellent (low impedance).
But as my intuition led me to believe, and the review confirms, the sound of their headphones is “meh”, or at least it doesn't justify the price of their products. And the issue is, whether with the 105, 99, or 109, that the EQ hardly solves the problem because of distortion.
I hesitated for a long time between my HD650 and the 105 Aer because I really love the ergonomics of the Meze, but in comparison, with and without EQ, from a purely Hifi and sound quality point of view, there's no contest, the HD650 ( and HD6XX and HD600 ) are much better.