I've had a lot of fun with it to be honest. You occasionally tab over to cast heals or a nuke with the mage using the earth pet for rooting, while the enchanter uses all those horrible spells like Jinx and such to keep the pet alive long enough to kill the mob. Earth pet root should be effective enough to keep the enchanter alive if you're being careful. You spend all your time controlling the enchanter, really.Don't do it with a mage. Mage pet heals are not sufficient to keep the pet up even against a slowed mob, and the enchanter will end up being the one tanking if you repeatedly mez between nukes or repeatedly mez a mob so you can slowly slowly slowly patch the pet up with your meager pet heals every 20 seconds which would make exping really, really slow.
Trust me when I say that it is a bad idea for a duo and I would know since I have characters of both classes.