Yeah luckily I have my FiiO E07K, powers them fine
I guess at $100 it is a tad much, though I don't have anything to compare to in that range. I did listen to my M50's last night after a long time without use and the E80's have the same amount of clarity but the 80's actually have a wide sound stage, M50's have pretty much nothing.
Compared to the ieb6, I def hear the difference in treble but its fine for me b/c as I've said before sibilance is my weakness. Nothing I've put through the E80's have sounded terrible.
Also, another review on the Amazon US version of the E80's said:
"[COLOR=111111]Treble has an excellent extension with a bright crisp sound. I'm very cautious using “bright” in describing treble because it always leads to sibilance, but in here SoundMagic managed to tune their treble without crossing that sibilance threshold, while still remaining bright, crisp, and airy."[/COLOR]