I never liked my Zero's! it wasn't the fit. tonality is off in a weird way, no amount of EQing could fix it. sound was brittle and hard.The Truthear Zero (or the Red) is a solid bet from a sound perspective BUT its very hard to wear/ find the right tips for a lot of people. The best description I saw was by another user on here who described it as "hangs by the tip" which is not a great proposition for an on the go/ mobile set. Nothing worse than having to fiddle with something in your ear constantly.
Of course, others dont seem to have this problem so YMMV if you pick these .
Up for sale if anybody wants it, almost zero mileage! (PM me, in UK).