Have the boat for my son (10 J) bought for Christmas after his old (used-given by relatives Dickie-part) gave up the ghost. The mileage is really very good. He's gotten along just under 2 hours on a single charge at the weekend. Ok, there are 8 AAA batteries required, but from what I've read here, I was very pleasantly surprised. The range is really very good. I guess there are min. 40 meters (further we ;-) not married us). The screws are still fit, despite two lighter "crash" on stones under water. Sometimes some dirt gets caught in the screw, but that's done more quickly. From me a clear recommendation - and it even looks from top, missing only one male (or female) which sits in front it.