Just received my pair of these. Boy do they sound amazing.
I've never heard bass done so well on an IEM. Mind you I come from Westone 4's and GR07's so it's all subjective.
What I like the most about these is the amount of detail that you can hear and how incredibly balanced it all sounds throughout the frequency spectrum. I feel like I hear everything at once and it's not too much.
I like the case but feel for the price they could have added in more accessories. Westone 4's are $450 and come with a plethora of tips, an 1/8 to 1/4" adaptor, an analog potentiometre, ear cleaner, instructional cd and a case. But hey, they do sound amazing.
My justification for spending so much is I just want something to perform to a professional standard so I don't have to worry about it's deficiencies. These sound balanced and detailed and I can see myself just enjoying them without worrying about what I'm missing out on.
That's one of the reasons I've stopped saving for multi-thousand dollar level DACs and amps. I just want something which I know will perform correctly, like a Benchmark DAC1 Pre. There has to be a level where you're happy enough to stop spending.