as long as its useful something but that will take to long to keep going back in forth from base to switch. maybe be in territory
It's supposed to take long, the idea is that you decide if you want an Assault Gun or a Tank Destroyer. It can be good at both because changing configuration can't be done in 10 seconds. Compared to units like the Elefant, who can't do it at all, it's a pretty good deal.