The build is nice enough, I really like the cable. However, the fit is a little shallow and with the ear tips provided you might struggle to get a proper fit. I find myself adjusting them every half hour or so. On the flipside, can't imagine these hurting anyone's ears. This is my only issue with the em6l.
The good stuff now. If you're not in the hobby as a collector/addict who seeks new types of coloration due to their brain adapting to the sound which leads them to buy new every 2 weeks but simply want good, detailed and accurate sound to enjoy music and leave the hobby, these can be your endgame and you wouldn't be missing much (nothing if you ask me). Being Harman with a slight midbass boost, this sounds absolutely fine to the way my mind perceives music these days. When I crave more clarity, I EQ the 200hz area and it works well. What stood out to me was the extra pinna area energy which sounds powerful, but was never too bright to someone coming from the moondrop variations. It's not that scary, I actually liked it and now I'm used to it.
If you're looking for one set to do it all, for more or less correct sounds reproduction this is it.
I don't believe in technicalities so I'll say there's not much preference I have now in terms of "details" etc between this and said 500$ set. Since the upper treble here is smooth enough already, it's a big step up from 20-30$ sets and realistically not much difference coming down from expensive sets.