Ours love 'em! I've been trying to get a picture of them rolling in their sand as it looks hilarious - but sadly no luck so far. They used to have a round bowl which they didn't use as much as those they have now - they each have a Ferplast oblong dish of sand - here's Sparrow's:
My WW loves his. He's finally figured out it's not for eating! I saw him rolling around in it for the first time yesterday and he looked so cute He's also taken to using it as his potty so I'm always cleaning it out.