I'm using a planck ez, but the layout is heavily custom:
http://www.keyboard-layout-editor.com/#/gists/eb0696806831fc...
That layout is a bit outdated, i moved super to the outer corner so I can palm press±hold it to manipulate windows in i3 with hjkl. Palm+tap is still enter.
The left hand uses fdsa to move the mouse and vcxz to send mouse scroll wheel events--so it's mirrored hjkl action.
I've done away with the number row in favor of a 10 key, and then mapped the symbols to their finger on the opposite hand, so '@' still goes with 2, but in a different kind of way.
Any symbol with a mate ()[]{} is similarly mirrored (index fingers do these). The idea is that if I ever hurt a hand (which is likely, since I'm a rock climber) I can map a foot pedal to activate a "switch sides" macro and I'll be able to exploit the symmetry to learn to do without whichever hand faster. This hypothesis is untested.
I originally designed it to give my right pinky finger a break, so the hands are further apart to give the index fingers more options and enter is a right palm-press.
Another nice thing about warping your mind to fit inside a tiny keyboard is that you can easily "embed" those neural mappings to a larger keyboard. I have an ergodox ez as well--which has plenty of keys, but I've just ported my planck layout inside of the ergodox and I really just ignore the other keys. I still like it because I can tent either side at different angles, which you can't do with the planck.
http://imgur.com/a/j3dik8b
Disclaimer: this is not a hobby for those unwilling to burn a lot of time tinkering. Also, "maybe it's a bug in my keyboard firmware" is a new and unwelcome thought that must be made peace with. But it's fun for me, and pinky doesn't hurt anymore, so that's something.