Inferno tactics.

Although I prefer Gogs over Magogs. I never upgrade them. Of course, this is debatable, but it can be very frustrating when you can't attack with a group of Gogs because you're afraid of hitting your own units.

Same here. With Liches, this feature is well-organized, and in Heroes 5, for example, upgraded Succubi don't hit "their own" units. But Magogs, it seems, can move around for a round or two while their own troops are engaged with the enemy – otherwise, an unpleasant process of self-destruction begins. :(