I've just had my second brush with the Mechanar on heroic mode, and it went much, much smoother this time, mostly due to the fact that we skipped Sepethrea entirely. After dying a couple of times and cheesing the elevator 6-7 times on the way to Pathaleon, we finally kicked his ass. He was hard, but not ridiculously hard; in fact I felt the challenge level was just about right for a heroic instance. And the loot! I walked out of there with four Badge of Justice, but also a Defender's Tanzanite, Capacitus' Cloak of Calibration, the Abacus of Violent Odds, and Edge of the Cosmos! No Sun Eater yet, but damn, this was a mighty fine run, even after the 20g spent on repairs.