I ordered a Xiaomi MI2s for my sister and apparently there was a promotion where they ship the Music Partners as a gift from ibuygou. I did order DHL shipping for the phone, so I already have one pair of my sister to try. I'm quite an audiophile and this is what I think of the headphones:
Good bass response. If you listen to drum & bass, dubstep, anything with deep bass, you're going to like these headphones.
Good highs, everything sounds crisp and clear.
The mids are... okay.
Overall, they sound good. With a little EQ'ing they really sound great. For some reason they sound a little less... natural than my Sony earbuds though, it's hard to explain. Overall they're really good earbuds though, especially for the price.
The build quality is mixed. They look amazing, the metal parts and the buttons are beautifully crafted. The cable looks awesome but it feels... hard. It looks like there's soft fabric arround the cable but the fabric feels like plastic. This isn't really an issue but I expected the cable to be a little thicker and softer. It doesn't matter though.
Oh, and they include 3 extra pairs of rubbers. 2 extra sizes and one pair of rubbers that look like this:
If you're looking to buy them, just go ahead, they're pretty good and they look awesome