RE: Wheely King for a 7 year old?
nothing wrong with a wheely king looks good and every thing and HPI stands behind its products good, the main thing u want to look for is will it have parts at the hobby store right away if you break some thing on it... If parts is not supported good at ur hobby shop then i would get him a 2 wheen drive traxxas stampede, or a 4x4 traxxas slash, any hobby shop u go in too will carry parts for these 2 and there ESC has 3 settings u can pick from.
setting 1 is 100% forward 100% reverse and 100% brake or 50% i think, dont remember
setting 2 is 100% forward and 100% brake no reverse
setting 3 is for kids and that has 50% forward 50% reverse and 100% brake
hope this helps GL