I just used it on a King Tiger, seemed to block vision. That said it is super unreliable, I've never had it fire while moving and I would say it only works 20 - 50% of the time when stopped.
I would suggest adjusting the muni cost to probably 30, fix it so it actually works 100% of the time and is fire-able while on the move. That way it can actually be used effectively offensively and defensively instead of a sure way to stop your tank for little effect.
After that the range can probably be adjusted but until the ability fixed, it kinda requires the range so you can safely use it (if it bothers to work at all)
