Mailman just dropped my SV-51 half an hour ago. Wow! The jet mode is elegant, I love it. Wings and fins are scary thin, but they survived the first transformation. I like the system with the little sliding rods in the wings, pretty clever. Transformation is challenging but less scary than for the YF-19. Didn't really pay attention to the gerwalk mode and went straight to robot mode. That thing is huge! With the wings fully loaded, on the little display stand, it looks fantastic. Hard to say if I like it better than my YF-19; I think they're equally good, but I prefer the darker and more stealth-looking SV-51 deco. Bring on the YF-21 now!