Well, considering that he described the LCD series 2 and 3 headphones in one of his reviews as "spectacularly yummy", (and with me considering these headphones as "overwhelmingly woolly"), I think I can wait to get Tyll's take on the X5000.
Having a sense of his preferences in a headphone, I don't know how much meaning that I would be able to get from his review of this X5000 headphone, anyway. I prefer a more neutral-sounding (possibly bordering on an analytically-sounding) headphone. He clearly doesn't.
Mine and Tyll's preferences obviously don't agree in how we'd like a headphone to sound. Knowing this, I feel like that I'm having to decipher code whenever he gives his impressions of a headphone. I'll definitely have to read between the lines (and employ a mental conversion chart) in order to try and make much sense out of what his impressions may mean to me. And, I probably won't be able to get a good sense for how this headphone portrays the upper midrange or how it sounds in the upper treble region, since Tyll doesn't seem to prefer headphones with a forward-sounding midrange or prominent highs. In watching and reading him at various times over the years he seems to prefer a fairly recessed (compared to a more "up-front") sound signature. I think he appreciates detail in a headphone, as long as it's "pushed-back."
Even though Tyll has listened to more pairs of headphones than I could ever dream of ever hearing, (and that provides him with an extensive frame of reference) my criticism of him (and other reviewers) is that they don't list the music that they listen to when evaluating the headphones that they review. This would be extremely helpful in putting his reviews (or anyone's reviews, for that matter) into a more meaningful context.