Can you believe its been five years since Gurren Lagann ? Well it has, and while Gainax haven't shown any plans in celebrating the anniversary of my favourite mecha series lesser known toy company Sentinel have given fans something to celebrate about. Revealed nearly a year ago to much excitement, the fourth installment in their Riobot (Riot Robot) line has finally been released. While Sentinel might not have quite the extensive resume as lines such as Kaiyodo's Revoltech and Bandai's Robot Damashii or Super Robot Chogokin, the few figures they have put out are said to be of superb quality (which is reflected in their hefty price tags). Costing a whopping 9500 yen RRP (£75/$120), Riobot Gurren Lagann has quite a lot to live up to before being compared to previous incarnations of the robot. Much like how the packaging for RIO:Bone (Sentinel's human character line) Panty and Stocking impressed with their fantastic graphics, Gurren Lagann also has a box...