So got 15k free xp from a mission I didn't know I was doing and fully upgraded my 7/1. This tank is a real sweetie. True jack-of-all-trades. Good mobility. Enough armour to make a lot of tanks think about where to hit you, at the very least. Like the 430, the gun seems to perform better than its stats should allow. But in this case it's the soft stats that don't compute.
I pity anyone who ground this before the HT line though. Cause if I had to grind out the top engine on top of everything else I don't know if I would've made it.