My son does good with the brushed in regular mode, haven't tried him yet in brushless, next week I hope if the motor mount comes, he has no understanding that if he hits something and breaks it it costs money, lol, he drives that digger like he stole it, he makes me more nervous with the R/C than with his ATV.
He's kinda crazy for just turning 4, check these video's out, I can't believe how comfortable he his on his ATV, he's had it for a year now, makes me proud every time we go out!
http://www.youtube.com/watch?v=m4zcHpAsHpY
http://www.youtube.com/watch?v=L6VbNFKvaOY