Over the ear is OK as well, I wear them like this.
Build quality is excellent, and not inferior to EX600 for the record.
- high precision aluminium body (check the crappy casings of expensive UM3X for comparison, I take aluminium over plastic any day of the week).
- lettering shouldn't fade for a while since it is printed below the transparent hardcoat protecting aluminium from scratches. Damage can only occur if the IEM casings are banging against each other or with other metallic items (keys...). This kind of event will damage any IEM...
- strain reliefs are long and souple, so they actually do their job (as opposed to 2-3mm long strain reliefs).
- cable is solid but a bit "springy", which can cause some light microphonics. But do not worry, it is nothing like the microphonics caused by a cloth-covered cable or a stiff quad-braided custom cable.
- connector is L-shaped. Somehow on the thin side, it could take a few brutal disconnections without harm, so all is well.
- no detachable cable for it's very uncommon in this price range. SE215 comes to mind but the provided cable is stiff and earguides are the worst ever.
Isolation is among the best out there. Slightly inferior to Westone/Shure equipped with triple flange tips, better than Westone/Shure equipped with single flange tips.
Seal is VERY easy to achieve due to the very small casings and the 5 sizes of tips. I have no IEMs that I can insert and remove faster than these (less than 5s).
And since the bore diameter is the diameter of the microdriver, sound is not affected at all by insertion angle, which is excellent for people having different left/right ear canals (like me).
That's it.
I have to start copy-pasting more, it's expected with a 60-pages thread, people can't read the whole beast.