The blue one is a Strikedog, pilot by one of the main antagonist Ypsilon in the show. This particular one used to be pretty cheap when the Takara DMZ used to be pretty abundant in the market, around $70 or lower (discounted/clearance). It now can cost you $150-200 in Yahoo Japan or Mandarake, but still among the easier to find ones. The middle purple one however can worth quite a bit, since its an exclusive Melquia repaint Scopedog ($300 and up).
in addition to what mpchi posted, the Red Shoulder Custom parts (missile/missile-box/gatling/) on my Melquiya are part of a separate accessory pack called MAP-03 (with Vanilla microman figure) as reviewed here:
Nah. Only 3 DMZs and a bunch of Actic 1/48, far from being complete, and no Yamatos either. DMZs and the Actics fits my appetite enough. And it is indeed a shame that DMZ line die so soon. We didn't even get a Brutishdog
I still have the Actics that came with the Pailsen-files dvd back in the day.
I do prefer the DMZ coz they scale a bit better with the Yammie 1/60 Destroids and HMR Glaug and Dougram for good Battletech/Mechwarrior casting. I may still get the Yammie 1/12 if I ever find an affordable v2/v3 and RSC kit.
At any rate, fellow MWFer jenius of anymoon/scorched-earth just posted his 1/12v1 review: