Stax is used by many recording engineers--to hear the good and the bad. They are great when you are listening to pristeen recordings, but I agree with Estrnad--it's fatiguing. An interesting side note is the processing that Headroom does in their amplifiers that give a little bit of cross talk with delay. I use one of these when I travel (by air). It really does make a huge difference on the fatigue factor--it sounds more natural and less "in your head".
