Any kneeboard will work fine for kids. We have two, the Hydroslide Razor has the pop-out retractable fins and the other is the Hydroslide Revolution without the pop out fins. I have had many kids on them at 5+ years old with no problems. Most of the kids prefer the Revolution without the pop out fins, its more of a "beginner" board. Nice feature about the newer style boards is the handle holder built in to the board. The kids can scootch up on the board without having to hold onto the handle which makes it easy to learn.
Just go slow at first 6-7 MPH, until they are up and strapped in and are holding onto the rope, then I usually bump it up to about 14-16 MPH for kids.
I saw the Hydroslide Revolution today at Costco for $99 which is a good price for this board.
Last edited by Fman; 07-12-2010 at 04:04 PM.
White/Charcoal, 2011 VLX
2008 Supra 22SSV