Having solved and studied the Tuttminx previously didn't hurt my mixed martial art match with the Icosaix. Drawing from some methods and algorithms I learned with the Tuttminx, I had the Icosaix pinned in about 3 hours.
The only really disappointing thing about it mechanically is that you can rarely make counter-clockwise turns. Most times you must make two clockwise turns when you want one counter-clockwise turn. I'd really love to see Oskar come out with a version 2 that fixes this problem.
It's a great challenge and fun solve. And now... I hear Eitan's Star calling my name.