indeed... all Image ones are ON EAR. I have the version 1 with the cupped ear pads and I get set them just about right so they keep out most all sounds, but it's not the same as an OVER EAR unit. I have not tried replacement cups, but I really do not think there were any changes made to any part of the design except for the coloration so I assume they are interchangeable... but I have not tried it personally.
to me, I have no idea why Klipsch went with a ear Pad instead of the ear cup... those pads look really uncomfortable.
I finally just broke down any bought a pair of x11i's, but I still use both headphones.