In a current game I am playing (5,000 points Soviet Assault) my illustrious Sturmoviks didn't show until turn 25 (out of 50). I had held back my armour until turn 20, to reduce any friendly fire oopsies. Once the flying artillery did show, they focussed on a couple of Jagdpanthers my opponent had parked on a hill. Haven't actually damaged them, but kept them buttoned up while my infantry sneaks forwards. Should be thankful they didn't attack my tanks.
Also in the same game, my opponent bought a Sturmtiger in case I bought heaps of infantry (which I did). Cost him over 1,000 points. He tells me it's green crew (couldn't afford anything else, and you don't have to be that accurate with the old Sturm) managed to bog it in a crater on turn 3, and immobilize it on turh 5. On a reverse slope. Behind a forest. Now if only his £$%"$ King Tiger could manage the same!