Lined him up with my classics the other day. Suprisingly he is actually a little taller than the Starscream/seeker mold. It's just that he looks really scrawny.
The thing that shines through for me with him that HasTak still have over any 3rd party is the quality and engineering they achieve whilst still being a simplistic and solid toy. He is impressive in both modes and I would not hesitate in letting my neice play with him. FP Defender or PE Motorbot on the other hand...
So yeah, I really like him. He has actually increased my faith in the FOC line and I am now quite keen to get my hands on G2 Bruticus and Grimlock.
I read somewhere that taking the barrel off turns it into a gun from the game, I assume having 3 barrels would make it a X-12 scrapmaker or the FOC equivalent.