Amazing, Crazy, Astonishing, three words that tell you about this Mamba Max 5700 from Castle Creations. The Castle Creations Mamba Max 5700 is a combination of a very powerful motor and ESC. To start off, this isn't like your regular motor and ESC system. This baby is brushless, but you may wonder, what is brushless? Well, this is where in a regular motor, brushes send power to the main rotor in the motor to be powered by magnets. But in a brushless motor, the magnets are on the rotor, and the windings are on the inside of the motor "can". This results in no brushes to wear and very high power and efficieny. Onto the features. To start, the Mamba Max is insanely powerful, has long run times, has settings that limit the power during startup, is 540 size with a 1/8" shaft, can handle upto 3s lipo and 12 NiMh/NiCd, and is programmable via computer. Though, words mean nothing. Once you try this out, you will never go back to conventional brushed power. Acceleration is blistering, speed can reach 40 mph and up depending on the vehicle, and control is amazing, coupled with a long runtime. To say the least, this thing is amazing! Although, this power comes at a cost, and it costs much more than a regular brushed system, it is well worth it if you are an avid R/C'er. If you are considering buying this, consider no more, just buy it!