I was looking for a good quality IEMs, mainly for HiFi and some monitoring on-the-go.
I tried quite a few different IEMs, including these praised Chinese "5 BAs/3 BA+Dynamic" miracles. Spoiler alert: don't fall for it, Chinese may put 10 BA drivers into one earphone, but there's no proper engineering/tuning, so it really doesn't matter how many drivers they may put, if they don't tune them.
I stopped my search once I heard ATH-E70. This pair is just the best 300 EUR can get.
It's 3 BA drivers, very well engineered, very balanced sound - although it does depend a lot on silicone/foam buds you'd be using.
None of the included silicone buds ( foam buds cut highs, I dropped them immediately ) fit my ears, I have generic replacement buds lying around that fit very well, so that ( the only ) problem is solved.
ATH-E70 are highly recommended for any application IEMs may be used for.