This might be a little dated, but since this was a decision regarding an IEM for trance, i would like to comment. Trance is all i listen to, and i've had the CK10 for 6 months...unamped they sound great, just a little lacking in the low end (totally lacking compared to an IE8) ...but then i bought a great little amp--the iBasso T3 which transformed the CK10 into a truly immersive trance IEM with non-overpowering but plentiful and immersive bass. But then i ordered the Sennheiser IE8 and received a week ago, they have probably 20 hours on them and i am totally blown away by the immersion, wide soundstage(not much height) but still incredible for trance, and the highs are a little less crisp than the sparkly CK10, but the details are all there, and the mids are great (not forward or recessed)....i know the Sennheiser IE8 needs atleast another 280 hours or so to reach it's full potential but at this point i am in complete awe while experiencing Trance and the IE8 soundstage--with the iBasso T3 that is. I am leaning towards the Earsonics SM3 because it supposedly has the largest/widest soundstage and overall better sound quality compared to all other universal IEMs. So just to conclude everything, I would highly recommend the IE8 for an awesome trance experience with the reverberant/visceral bass and cool soundstage and everything, but if you're kind of a detail freak, the CK10 is phenomenal with trance. Its been a week since i've had the Sennheiser IE8...and i've probably listened to my CK10 for about 4 hours throughout the week, I just love the immersion that the IE8 brings with Trance. It's like im in a small car with amazingly clear speakers when i hear the CK10, but the IE8 makes me feel like im drowning in a pool of music with clarity, immersion, deep bass and transparency.