Great gems these are! I think sonically these are very similar to JVC-s400,i'd say the bass is even tighter than s400.
Compared to the MH1 these do have a more in your face mids but i like it opposed to the slightly recessed mids of the mh1.Treble of the es18s although are not as extended or smooth as the mh1,but has more sparkle to it and doesn't have any nasty spikes in treble either.Bass is where i find these clearly better than mh1,The weird thing is that although es18s has more mid bass & sub bass than the mh1,it seems more tighter overall.Has more mid-bass rumble & rounded bass impact.I like it!
ES18s has a wider soundstage,even more height i must say.But Mh1 has more depth and is more 3Dish than the es18.
One thing i have to point out is that I listen straight out of my (voodoo modded) Galaxy S.No amps involved,which people here say that using one improve sq of the MH1.
Also es18s are so easy to drive! You can drive these to sufficient volume,no matter how weak your source might be.
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I'd like to share the excellent impressions by our resident Indian audiophile,esanthosh.Might help this thread.
ES18 vs E10
https://www.techenclave.com/community/threads/random-iem-headphone-rants.106883/page-48#post1637458
ES18 vs Philips SHE3570
https://www.techenclave.com/community/threads/random-iem-headphone-rants.106883/page-67#post1700576
Budget IEM Shootout: SoundMagic E30, Brainwavz M1, MonoPrice 8320, SoundMagic ES18
https://www.techenclave.com/community/threads/random-iem-headphone-rants.106883/page-50#post1650811
Scroll down through those links to find the impressions.