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This set was unexpected and showed up surprisingly on LEGO.com months after the other DC sets were revealed. I think I'd call it the best in the line, and of course it's hard to find, so fittingly and unfortunately, I got it last.
ROTA (Remotely Operated Technic Arm) is a mobile robotic arm created with pieces from the MINDSTORM NXT 1.0 and the 8043 Excavator. ROTA uses 6 motors (2 NXT and 4 PF), 4 linear actuators, 2 PF receivers, 2 PF remotes, 2 NXT's, and 1 battery box. It is controlled via PF remotes and another NXT. It is around 20 in. high, and about 18 inches wide.