Clapped my eyes on a Superstox G12 last night, Trial run at Blackpool Indoor Club
Motor/ESC was with Mtroniks Mardave Racing G2 Brushless System.
Setup was as kit and Paul the owner/driver was very pleased with how it went, smooth, quite quick and very drivable without having to spend a lot of time tweaking.
Was about to get a Mardave V12 but this is in a class of its own regarding design and construction but affordable.