Just got a pair of PHILIPS SHE3590(Since the 3580 is out of the market) last saturday, and when I first use it, I really don't like how it sounds, it is not full bodied unlike my previous IEM (that is not worth mentioning Haha) and then I discovered that I didn't push it a little bit more to get inside my ear. After pushing it a little bit more to get inside my ear. I was blown away how a 12$ IEM sounded like that.
BASS: I really like the quantity of bass in this IEM. It's a punhy bass IMO but not overpowered, it is controlled. And I really like the bass on these.
MIDS: I really like how to vocals sounds on these IEM especially female vocals.
HIGHS: The highs on this IEM is crisp and really clear, but a little harsh on some songs. It hurts like it bore holes on my ears. But by reducing the volume the harshness reduced too. I'm still hoping that the highs on this IEM become smoother as I use it. If not, I will try to replace the stock tips on these.
MICROPHONICS: The cable is really noisy but I don't mint it at all haha.
CONCLUSION: At the 12$ Price range you really can't expect it to be flawless regarding the build quality and the microphonics, but at its price I never expect it to sound very impressive. Still hoping that the HIGHS becomes smoother by using it again and again or by trying other tips.
Here's my impression to my first IEM. Hope you enjoy reading and sorry for my english.