I had also pre-ordered the X5 and had an extended demo earlier and thought maybe I can cross-post my experience on comparison with hm901 here for reference:
I would also agree with
@currawong that the X5 has a very organic, smooth, non fatiguing, yet detailed delivery.
A simple quick A/B demo may not do justice to it against DAP/amp with more edgy tuning. With one of the best DAP UI and built quality at a very reasonable price, X5 is really hard to pass up.
I also see many asking for the amp bundle but imho with X5 has more than sufficient power to drive. I am also most impressed by the clean pitch black background. Even with my TG334 or JH13 there is hardly at hiss at all.
James, my only quibble is the silver buttons that really detract the aesthetics for me. Would you be able to paint them in a much darker gun metal type paint? Yup I know I'm nitpicking