Pros: Extreme technical capabilities
Cons: Timbre and character
I won't write too much about this because there's much that has already been said about it. I've had this for a long time so the new toy syndrome has worn off, and boredom has set in. However recently I've been appreciating its sound more, and decided to share some thoughts.
If you like detail, speed, sparkle and great microphonics, then this is your iem. It is a specialised tool that enables you to comb through any track for deficiencies if you want. This comes with a downside though, and it may bother some people. The timbre is not suitable for every genre, sounding unnatural and sometimes clinical.
This is perhaps the best earphone for trance and other forms of electronic music. The speed and detail both complement the artificial perfection of the genre, and the isolation truly allows the listener to float off into another world. The sound signature is very well suited, with quick bass that never fatigues or congests. The highs are magically sparkly, giving the feeling of space, and the soundstage is quite good as well.
Most other genres are certainly performed to a high degree of technical ability, but whether you will enjoy it as your only earphone is up to you. I find it enough, but there are just some moments where I want something different.
Build quality, comfort and isolation are all near perfect. The plug could be right angled, and the other two are arguably enough for 99% of people 99% of the time.