I just played a mech lance versus dug in infantry company supported by armor- including a pair of heavy Demons, hull down behind a pretty heavy mine field.
and arty support...
It was fun- ended up with a lot of mobility kills. Tanks missing treads or with junked engines, jammed turrets, etc but still able to fire.
That's potentially very deadly (one of the mechs, a Mongoose II charged forward, thinking the heavily damaged Demon and it's supporting infantry would be no sweat. My tank brassed the mech up with its next to last gauss slug and ripped in with the remaining laser. Then the squad's worth of motorized infantry hooked in with their RPGs and managed to core in for a critical hit. Sadly we didn't knock her out!)