Well, here is my short impression of the HE5-LE after spending a week with them. It was driven by the Matrix M-Stage w/ class-A biased OPA627 and AMB Gamma2 and its companion Sigma25 power supply unit FYI.
Overall the HE5-LE is a fine performer if you like your music to sound lean with gobs of treble details and air between the instruments which in my opinion, makes it a perfect companion with faster-paced music with tons of instruments playing simultaneously. The upper midrange to lower treble still sounds slightly harsh to my ears though it's much more bearable compared to the older HE-5 which was just painful for me. Other than that, I still have a slight issue with how the different instruments do not "mesh" together but it seems that the problem is less mitigated if you crank up the volume louder. I also have to add that if you're looking for body and warmth then stay away from the HE5-LE as it will not provide that but as I've said before, if you like air, speed, leanness and treble "details" then the HE5-LE is the perfect can for you.