I haven't even unlocked BT-7 currently at BT-2. And bow these BT-2 are FAST beyond imagination, armed with decent gun for its class and sufficient armor to go against other light tanks.
And I thought my fully upgraded MS-1 was the light tank
.
In game My BT-2 is churning up more money than ever with other lower tier light tanks.
So I expect improvement with BT-7.
What I like from these BT-2s is that it suits my temperament just fine. I like its maneuverability as I can dictate when and where to engage the enemy.