[Imp]

I agree only dabbled with 4's previously I normally go the 3's plus a few StuG's route myself.
So first time using 4s to any extent & in my wisdom changed my StuG's to 4's as everyone can engage at medium to long range. Thinking was till the Allies get APCR the StuG has a clear advantage at range being virtually impervious to frontal fire.
Turns out not only are 4s vulnerable to most tanks at any sensible engagement range they need to give infantry a wide berth to.

That makes them not much better than Marder's especially on hilltops in a battle I would take a few Marders over the 4s as they are less than half the cost, you know to be careful with them