I received the biggest in-ears I've ever possessed today. Thankfully the sound is just as big. Yep, that's the already large CKS1000's next to it. Comfort is actually very good. The ear hooks work well. The cable is kind of cheap since everything else seems to be top notch. Only three pairs of tips come with it and a very nice hard case. Tip rolling on this thing is gonna be impossible since it possess a huge nozzle. Same system as the JVC FXD series for those who know but much bigger. The sound is very tip dependent and it's the shallowest fit I've ever experienced. I usually use medium tips for most of my earphones but had to go with the large on the these.
As for the sound, it's top notch. That big housing allows for a deep sound. The bass driver works well in the background producing deep and well controlled bass. Good sub-bass but not too deep. Just a tiny bit of mid-bass. These are not bass light by any means and not the boring neutral signature. Vocals are not Audio Technica forward but it's right there in the mix. It's actually very smooth and no harshness to it. Treble is very sparkly but also very smooth. No fatigue to the treble what so ever. What's actually quite stunning is the stage and instrument separation. The music layered quite well. These are somewhere around the Philips Fidelio S2 and AT CKS1K type of sound. Possibly more towards the S2 signature. Very well balanced and controlled sound with an excellent attenuation into the fun realm of sound. I think KEF's first attempt into the headphone/earphone world is a knockout.