It's great to hear all these varied impressions and comparisons of the MEST!
I received mine a couple of days ago and will be writing a full review!
In the meantime, I'll try to drop by here and share some impressions with you and comparisons!
I've listened extensively to the EE Legend X and own the EE Nemesis.
I've also got the Itsfit Fusion, which I think is probably the most 'like for like' comparison out of all my IEMs in terms of price and driver configuration (and tuning, to some extent).
Finally, the $1150 Stealth Sonics U9 Hybrid IEM too.
Oh, I've also got the Final Audio A8000 on loan, which I'm currently finishing up reviewing.
I'll save my main impressions until I've listened more, but my immediate impressions after a few hours of listening were:
1) huge relief! Since listening to the Nemesis, most other IEM's just sound weak in the bass in comparison.
The EE Phantom and Stealth Sonics U4 have good bass but they are all-BA IEMs so it's not really a fair comparison.
So I was kind of praying fervently that the MEST wouldn't disappoint me in that regard, and I'm delighted to report that it didn't
I have yet to compare it back to back with the Nemesis (although I've listened to the Nemesis a LOT prior to that session with the MEST), but the MEST low end seemed engaging, powerful and rich, but not bloated or bleeding into the mids
I think to some extent it's never going to be entirely fair to compare the bass of any other current IEM's with that of the Legend X or Nemesis!
EE designed a custom DD (the WeaponX) especially for low end impact and extension. Then they crammed TWO per side of them into the IEM's
I can't imagine any single DD IEM (hybrid or otherwise) is going to reach that same level of low end impact, slam, rumble etc.
Yes, some may come close, but I think from an engineering viewpoint, I'd be very surprised if anyone matched it.
So I will try to keep that in mind objectively when comparing
2) MEST has a big, open soundstage, generally a very good technical performance and, importantly, a hugely engaging sound signature that brings so much enjoyment to my music
More to follow in the coming days, happy to answer questions or post comparisons; just ask