It's a shame that this great IEM has been getting so little attention lately. Many claim the new FXD80 is superior and cheaper (if I am not mistaken). Well, I haven't heard FXD80, but I have to say that FXT90 is a superb sounding IEM to my ears and an absolutely fantastic bargain at $100 price point. Even if they were to cost 4-5 times as much, I wouldn't say that they are overpriced compared to the current flagships from Shure or Westone. I find FXT90 just as technically proficient as SE535 or Westone 4, or at least the differences are so small that they are really don't warrant the huge price premium at all. FXT90 is an amazingly detailed, spacious and powerful sounding IEM. It provides a sense of depth to the sound that most IEMs, even those costing several times more often don't. The soundstage of FXT90 may not be entirely true to the recording and is a bit compressed in width, but sounds very natural IMO. FXT90 provides a very 3D listening experience and gives weight and depth to instruments and vocals without introducing incoherence to the sound that multi driver balanced armatures do. I find this IEM a great alternative to multi BAs with most of the properties than make multi BAs special - like depth, dynamics, weight and sense of realism, but without the critical flaws that pretty much all multi BAs exhibit to my ears - lack of coherency, unnatural tonality, strange frequency response, excessive dependence of sound quality on fit and tips and other issues. A true winner in my book and it's hard to believe FXD80 could be even better, while costing the same or less.
