I've got something similar to this the other day for £8.99 (BARGAIN!!!), and well as we aren't gonna get any snow over here, or at least Bristol anyway I am tempted to take it to Bansko with me and try it down the blue run back down the village.
Would they let you take it up the gondola with you... and has anyone used one and know if they're actually any good lol!
Think you might end up walking most of that back to town, I should think these have a lot of friction and dont maintain speed well. Saying that, you wouldn't want speed with it as you'll probably break a leg. Fun for messing about at the bottom with (maybe combined with games), but probably pointless on the mountain.