I have one fitted to my King Hauler. Turns a very good model into a very, very good model! Clever use of controls on a 4ch system to give multi-function operation, though it can test your memory at times! Sounds are good and realistic, not just engine noise (running, start and stop), but indicators 'tick', reversing 'beep', gear change 'clonk', trailer couple and un-couple 'clonk', brake 'squeal', air tank hiss etc. The engine noise is not a generated item, but recorded from the real thing. Occasionally the engine sounds get out step with the controller resulting in some rather odd combinations, but overall good to very good. Clever use of tx/rx means if you turn off the tx, you get the engine stopping sounds and when you turn it on, you get the start-up sounds. Attention to detail is extreme at times, eg if you turn off the tx with the lights on, then turn it back on again, the lights dim and flicker as the engine 'turns over' and come up to full brightness when the engine is idling!
Rating: 
[5 of 5 Stars!] 
