FiiO - FD5

My pick would be the fiio fd5 which is dated and also isn't in manufacturing anymore but 2-nd hand is cheaper anyway (that's how I got mine) so it isn't really a practical thing to chase.

I've got a bit of a Fosi collection, i've also got the Fosi BT20A Pro amp going into some expensive speakers, Fosi Luna turntable with Fosi Box X5 preamp, and Fosi i5 headphones. Honestly i got the IM4 IEMs just because i like backing Fosi on kickstarter and because the IEMs were affordable, i wasnt expecting much, especially since it is their debut entry into the IEM world. Keep in mind that just before my IM4's arrived, i got FiiO FD5's and Letshuoer EJ07M in, which are both much more expensive and up-market. i listened to the FD5's and though that they were waay too warm for me, so i changed out the nozzle and installed the triple flange ear tips which definitely helped, then i tried the EJ07M, which aside from the GOD AWFUL cable they come with (which i would have cut up and thrown out if it weren't so expensive) they are definitely great sounding.. but you'd expect that for how much they cost and the reputation they have. Then the IM4 arrived... and I put them in and I couldn't tell you exactly what it was but they just sang to me. I listened to songs I love such as The Light From One by Ane Brun and they just blew me away even though they're affordable. TL;DR Fosi IM4 is gud! <3

The features and driver compliment don't tell you anything about how it will sound, or the quality of it. if the company wants to make a great sounding pair of IEMs they will, there are great sounding IEMs with just dynamic drivers, and crap ones with multi driver topology. I absolutely love my Fosi Audio IM4, I love my Hidizs Mk14 Turris, I love my Fiio FD5 and my Letshuoer EJ07M.