Summary: lack of high fidelity sound, bass it way overwhelmed hinder the mid and high, there's a mid hump bass, not good enough sub-bass, no punchy drum bass pedal. don't buy it, it's not worth it. even philips she3595 is so much better when using EQ in poweramp app for android.
Summary: These iems are better than some entry levels (Shure 215/ hifiman RE0/ RE 400/ Sennheiser CX300) with a wider soundstage due to the 13mm dynamic driver , however need serious burn in for at least 50 hours to shine , lack sub bass and treble , perfect with vocals (Norah Jones / Yael Naim/ Celine Dion), not so convincing with classical music even at 24/96, bass not punchy enough for electronic /dub but should be fine with reggae, pop and alternative genres.
Pros: level of details, vocals, soundstage
Cons: poor treble, need burn in for at least 50 hours , muddy with bad recordings
Summary: I bought this at the Sony Store and regretted by purchase for the first two days. They were very dull sounding. I found myself searching for eq setting to get some high frequency response. But on the third say I noticed the treble opening up. Previously select EQs became to bright. These will never be Grado-revealing, but the highs opened up to reveal a nicely balanced earbud. I won't even mention the bass because that was always fabulous.
Summary: here's a weird thing about them: these sounds punchy and more enjoyable if worn around the ear (worn somehow like se215), if worn normally, these sound little bit muddy and mainstream, unrefined and lacks punch. i don't know why, but it's true (might not work for you, don't blame me). wearing them around the ear is a bit tricky though!
Sound: After burn-in (and worn around ear), the soundstage is large, bass extended well and punchy.
Summary: Quality sound as expected from Sony, but I have to say not as good as by previous Sony in ear headphones, very bulky in the ear therefore I am a little disappointed, I would not have paid full price for them.