I love it, it's one of the things that makes my company work so well. Also, it effects the hellcat which is pretty awesome. Cloak that sucker and put your inf around it, it can provide last minute AT fire and cover your inf defending the immediate area, and makes more sense to me for cover since its a long range tank compared to shermans and halftracks.
Quads also make very good mobile cover points due to their long engagement, and a bumrushing sherman with assault infantry also works wonders. Put an officer with the squads and yeah, small numbers can hold ground pretty well (don't overstack like 5 squads on the tank though, that screams ARTILLERY!)