Finally able to tested Crimson properly in the last two days. I'm not really a fan of Helios, but Crimson is definitely a different story.
Big soundstage image, with lively and energetic character, sweet vocality without being too forward (like with Helios), smooth and crisp sparkle treble, with punchy bass that reach well to sub bass area. For my kind of songs (jazz, pop, country, and some instrumentals) Crimson really show its real strength.
Not saying it can take down my Radon 6, but for the price, Crimson is really a solid IEM compared to some other strong contenders like Mest Mk3, Monarch Mk3, and even U12t.
p.s: Paired really well with Cayin N7