I'm going to weigh in here, less than someone with as much experience in the game like you guys and more of a fan of the series. What Resin said holds true, GPG did sell out the core community and we likely will not be seeing a sequel anytime soon. If SC2 is an indication of how corporate entities care about the fanbase, than at this point literally a decade later after release, what harm is left to be done? The unit is balanced and I will explain from my personal experience with it in game after trying to see if I could use it in a "broken" manner.
The unit has great offensive capabilities and range, but lacks speed both on ground and in the air. When transformed, without proper air control the units lose to even t1 interceptors as the landing sequence takes about 2-3 seconds to re-deploy them as ground units. So this makes their transformation usage highly situational as any intelligent ai or player could easily counter them, making their added mass and energy loss devastating early to mid game. And while their range is good on ground, they can easily get out ranged by t2/t3 arty and defenses. It is impossible to rush this unit in with proper air cover and not get it attacked by a gunships or bombers, both cheaper and faster than this unit.
So how is this not balanced?
P.S: Mr. Frenchmen is right, Chris really should see what you done, the weapon effects and even the model are top notch!