I bought Shaddix' MC5's and have had them for a couple of days.
I like em'! Very light and they do look nicer in real life. Have to say I like them better than the RE0's. Lighter, better looking, and nicer build quality. You can see in the pic I have the big bi-flanges on them with adapters made from Shure tri-flange stems.
These phones are interesting. Very tunable just with tips. I think they have more bass than the RE0 with the biflanges(from memory) but the detail is smoothed over a bit. With my Kanen KM948 tips they have a bit smaller stage, less bass, but true Ety level detail. The differences are more pronounced than with the RE0. Bass and detail levels don't change as much as with the MC5. I agree with those that say they have an aggressive sound. Even with less bass I prefer the Ety's bass to the RE0 since it has a bit more bite and the mids have a bit more emotion. Even with an amp and bass boost the RE0 didn't develop the emotion which, after a while, made the RE0 fall out of favor with some of us.
I can't do what I want with them just yet. I will continue to burn them in for one. Joker has some M11+ tips I would like to try on them and also my Ety S-adapter. I would say the big bi's don't give enough detail but I do plan to remove the filters which should brighten them up and bring more(according to Anaxilus). The right tips, if the filter mod does bring more clarity and detail, and if the S-adapter does what it does with their big brother, these will be borderline top-tiers. I feel they are already one of my best purchases. Outside of the cheaper version of the normal Ety zip case I have zero to complain about with them.
Tunable, EQ-able(if wanted), solid build, good isolation, good price, color options. Even a bit more soundstage than the other Ety's. Totally recommended for those who want the particular signature(ala Ety, CK10, DBA-02, RE0, etc)!