I have the same g15 keyboard, and although the g15 mod from curse doesnt work for me (its just a glorified bar mod) im having trouble actually getting my keys to work with Keyclone.

When keyclone is not running, and I press my G1 key (mapped to CTRL-ALT-1) it presses the correct key on my action bar, and the same with the other account, however when I open it with keyclone, the wierd keys g1 (CTRL-ATL-1) do not get passed to either machine, and no clicking happens, however my g12 key, which is just F12, still works. I shut off keyclone and the wierd G15 keys start working.

Other than that small problem, it works great.
Just rememeber the keys have to be set in the G15 profiler, and then on both your characters keybinds.