[Imp]

I think the article shows pretty much the problems, 44-45 used a total of 3 times once as an arty base then it broke down. No mention was made of it scoring a kill so perhaps HE was all it had available.
Capturing large amounts of them or taking over a country with the manufacturing base for ammo & spare parts is a diffrent story, its now become part of your force.
I would not be surprised if they often broke down on the way to the next battle if you are talking tanks, this was the after all the 1940s.