Just thought I'd put my 2 cents worth in.
*Firstly Yes Brushless Motors performance is highly superior to any brushed motor and probably just about any nitro engined car.
*The current speed record for an R/C car is held by an Associated L10 with a Brushless system Installed. The car was officially clocked at 179 kph.
*Some brushless motors can reach 100,000RPM (without Load).
*The reason why they are so good is simple. No friction or drag caused by brushes rubbing up against a comm on an armature.
*Yes you do require special 3 Phase ESCs for brushless motors.
*No a brushless motor won't work with a standard ESC and vice versa.
*Brushless motors are basically maintainence free apart from cleaning and re-oiling the bearings.
*They do not last for ever as eventually the magnets do weaken.
*A brushless motor and dedicated ESC are very expensive.
*They would not be legal to run in any circuit race that I know of.
*They are legal when used in an electric car for drag racing.
*The concept of running brushless motors in a R/C Car is still in its infancy and I personally would hold off until they become cheaper and more mainstream.
Hope this helps some