My children did surf one a few times, standup and turning, with a rig for children 3,5 m2. Next time I hope they can use a rig 5 m2. I think a Rio S has anough volume and stability, besides after 1-2 years they will probably enjoy the Rio S more then the Rio M (looks to me more an allround beginnersboard ?). At this website the video shows a Rio S and surfing looks good (also the female of cause ..). Has anyone experience with the Rio S (2010 or 2009, shape is the same I think) ?? Or the Rio M ? Let me know please. Thanks for your advice for now Roger.