Just used both side by side in HL2. I'm going to send back the Habu wo/ replacement. Even if the next one's perfect, I preferred the MX. It fits my hand better (maybe a year w/ a mouse will do that to you), and doesn't seem to cause sweaty hands...something the Habu's matte back managed to accomplish. Good luck to all you! I'll be hangin' on to good ol faithful.