Wow, I haven't bought any since the 1/72s, but this....this is definitely a must-buy. Initially, I didn't like it or the YF-21 (preferring the YF-19), but both have grown on me so much, that the VF-4 & YF-21 are my favorites. Huh, it's interesting that the VF-4 seems to have the most complex transformation scheme since the YF-19 & YF-21 are designed far afterwords (in canon, at least). This design is really one-of-a-kind - I guess for a good reason, hah hah.
Hmm, since I haven't perused the past discussions, I wonder if it took any cues from the Queadluun-Rau like the YF-21. The VF-4 & YF-21 seem to be the only two mainstream designs that are 'top-heavy', as the VA-3M Invader & Feios Valkyrie are even more obscure. I guess there might be a few others, but they don't have the boxer-look quite down. Eh, I guess this question falls apart since the fighter mode stands pretty much alone & other than the P-38 Lightning, I think only the SR-71 shares the design.