I actually like the sound of the H1, it's more natural, whiles the H3 is more clouded or muffed up, I won't say the music I listen to is the best recording available, but listening to the same music using the ex600/ex800st and the XBA and the H1.
ex series, the vocal stands out, as you are sitting at the front row of a concert.
xba 3 has more seperation, also have the XBA 4 but haven't used it yet, bought it about a week ago.
H3 every thing is well balanced , but the sound is much wider.
I actually think the H1 sounds better than the H3, sound is not as wide, but for the price different i won't consider the H3, the differences is only a margin, also the connectors on the H2 and H3 iem is very easy to come off, and will get loose over a period of time.