I have both the O2 and L3, O2 sounds a bit airer, lighter, clear. but L3 is much thicker, smoother, more dynamics, better bass, more pop. Going from L3 to O2 I feel like it's making the music naked. I think O2 is a bit overrated, but I'll give it some more listens
im sure he will deliver but hasnt responded to any email, im just sending all these polite emails, never rude or harsh.
hopefully enough people will see all these complaints about headamp that they'll take them out of business. I ran a search and there are many. It is why im selling my pico now. So people should only buy his product if they must, used, because they will get zero customer service if something goes wrong or even if they have a simple question.