Design wise it is basically Birdramon but turn into a robot. as I mention before this a redesign of Birdramon but with armorer but with the American Fusion toy line he has a blaster (use your imagination to pretended that the ball joint is an ball lazer) another design choice is that he is blue instead of red like the original Birdramon, his wings are now plain wings, and the 3 claws are sunspots to be tail feathers, he also has the MetalGreymon head on his back.
For his Articulation on this figure is limited his neck and head are on ball joints, wings are on ball, Tail is also on ball joint, and the legs and feet are also on ball joints.
all that is left over is the left hand of the Greymon figure
Pictures from DigimonWiki
Alterations it a lot for this, I give the toy this no color alterations on the toy (the closes you could get is the darker blue on the Xros Wars toy and the lighter blue on the Fusion toy). but it's molding is super different, the neck had hinges to look forward and backwards, mouth could open on the Xros Wars toy, and the legs had ratchet joints on it.
For the MetalGreymon toy the claws could move in and out, on the MetalGreymon head it just slide on but it did not fit on it and was shaky and was a mass release problem, while on the American toy it was a connecting port with a ball joint, and finally and the obvious one on the American toy it dose not have the MailBirdramon legs on it's back for cannons but on it's legs for the American toy.
Should you buy this?
You should because it's not all bad. If your a fan of MailBirdramon in either Fusion or Xros Wars then You Should buy it, if you like this version of Birdramon then you should buy it, if want to make MetalGreymon then you should buy it. Overall this is a nice toy and is insetting but fails with his body looking up, but that is a bit of how he was in the show. And as for MetalGreymon it's ok, some people like the US version some like the Japan version (some people like this more ther the japan version) but it is ok , main turn off is the giant left arm, the leg,s and back cannon not being show accurate.