I had the Stax 009 and 007 for 4 years running from a DIY Carbon amp. The LCD4 is competitive with both those IMO, but crucially for me, better in the mids and bass. They are both detailed (enough) to sound natural yet super smooth, and really al pst never go into fatigue or sibilance unless the source is seriously harsh. Unlike the Stax that jumped on any harshness and increased that effect x 4 times. Detail is great, but it has to be realistic and zero fatigue, especially in headphones, and if you play at anything like realistic levels of volume.
So in summary, you get great detail with the LCD4 but there are no treble nasties that so often accompany that. The mids are creamy and vocal very natural and textured, the bass, well, the best bass I have ever heard period...... hope this answers the previous posters question.
On that reliability downer, I have had no issues so far. And Audeze have honoured failure claims outside the warranty period. Normal warranty on Stax is 1 year, Audeze give 3 years. Also it IS transferrable, unlike Utopia for example. My Stax 009s failed at 23 months BTW.