Took my leopard 2 upto freshfields beach today for a little run. She performed admirably although the plastic pieces on the sprockets that catch all the grass also clog with sand. I took them off and she ran much better, although the track did ping of a couple of times. As the tus and most of the other mechanical bits are fully enclosed I'm not to worried with the ingress of sand, but I will be doing some maintainance just to make sure !