The Technic sets are alot of fun to put together, and this one is no different. The EpI droids seem to have been made for this division of the LEGO line, with the collapsible features. The Pit Droid goes from a collapsed position to standing by pushing on the eyepiece. It comes with a pair of "diagnostic" tools, and is a little uneasy on its feet perhaps, but once put together it is a marvel to watch it unfold and snap into a standing position. Highly recommended.