I do agree that the bass does not have much impact but for me I think the bass has absolutely perfect speed and feels deep and tight. Sometimes they remind me of the Etymotic ER-4 bass which also does not have huge impact but otherwise reaches deep and precise.
Regarding mids I do not agree either. I think these have a very intimate sound when it comes to vocals and mids are very present to my ears. I think it is so good to hear a closed headphone not being dark sounding but sounds airy and bright. Very refreshing
I am not disappointed by these at all in fact they have become better and better after some more listening. Right after coming from HD650 and T1 they can sound too bright but just like the ER-4 these have something very special which is more likely to win in the long run.... If I know myself correctly.