Pros: Great value for money
Cons: Lacks a lot of detail found in higher end amps(E11). EQ1 muddies sound.
Like ^ I bought the E6 amp on a whim to try out, it kinda came in a bundle with the Feels Pro 900 and Hippo Boom from Jaben. To tell the truth, the bundled in-ears did not synergise with the amp at all, details were lacking and the sound was pretty muddy to me even when i set it flat. It does better with headphones of course and is able to make my m50's sound better. It made the soundstage more natural and wider than that of my Iphone(duh anythings better than that :3).
However it is not as detailed as the E11 which I bought before the E6. Also, while the EQ2 options and EQ3 are pretty nice EQ functions of the amp, EQ1 itself was down right terrible, it was muddy and any vocals where pretty much drowned out unlike the E11's bass EQ. It could be my bias since I do not have drum instrumentals and rock, EQ1 could have probably done better.
Overall I think the E6 is a good little portable amp, great little design, average amping with some detail loss. Good to use with the more affordable side of headphones where they tend to be more bass overkill. Probably would have thought better of it if I ever used the E7 or E5 amps.
Just to let peeps know
EQ1 bass boost
EQ2 +db(forgot how much)