I'm impressed with Yu-Ki. The design never did much for me, but Ando's sculpt really emphasizes the whole 'death' aspect that's supposed to come off of the design. I'd definitely buy them, if they ever become available. As far as the other stuff though, mostly unimpressive. The SIC design did nothing to improve New Den-O Vega Form for me, and Sieg looks kinda plain. G Den-O... continues to be G Den-O.
Also lol at whoever said DiEnd is supposed to look sleek. He's a boxy design in the first place.