nyu3Anyone? I'd like to know this as well! Also, I was able to wear the K10U down instead of over the ear by swapping the left and right channels. Think this would work with the Zeus?
nyu3They're bigger than the Kaiser U, but you should really only compare the part that goes in your ear. The part of these that looks big is the body, but that's not going in your ear unless you're a giant.
For me, the K10 (and nobles in general) fall out, but the Zeus fits fine, as does the Massdrop Plus, all of our NuForce collaborations, and most other audiophile IEMs (JH, QDC, etc).