Cool game, although the central concept of the game is essentially Advanced Wars. However, Battlestations as mobile bases and glider-borne infantry are pretty cool ways of switching it up. Whether or not this succeeds all depends on the execution of the designers.
Well once you get to BFT or the likes of such, then you're in good hands (I loved the huge cannon). But its the gap before then that is problematic, when you're only the 1st or 2nd heavy. If you run into enemies with machine guns or swarm fighters that heavy wont last long.
Here's the problem, the fighter side is way easier to follow than the heavy side in which you become target practice and will face constant annihilation back to your previous form. Whereas with the fighter/sniper side, you dodge every bullet like you're in the matrix. Fun, but unbalanced choices.