Nope, but I read up on them and watched the vid, and they seem quite neat. Perhaps not quite as neat as Lego though (which they seem to be modelled after), and also very expensive for parents on a fixed budget.
Little story for you:
Anyone remember those Lego "bricks" you used to be able to buy? Just a cuboid brick of Lego blocks with a couple of wheel sets on the bottom, and 1 or 2 'platform' pieces on the side, with maybe 3 or 4 'windows', in a plain cubic or rectangular box?
Well, when my niece was about 5 years old (which is 25 years ago now) I tried to find some. Could I? Could I hell. It was all space stations, or car parks, or hotel sets, with little Lego people (who you used to be able to buy separately) in boxed sets.
After lots of searching, I found an old-fashioned toy shop in Richmond, BC (I lived in Vancouver at the time) that had a few dusty old boxes on a back shelf.
"Don't make them any more," I was told, seconds before I cleaned him out of the last of his stock (3 'cubes').
Come my niece's birthday, and after all that effort - not a sausage. She opened them, said "thank you", and then put them to one side and proceeded to drool over the latest Cindy doll she'd been given. I was mortified.
About 6 months later, I came over to my sister's house for a spot of 'babysitting', and was sternly informed that I should help her "clean up her room". I walk in, and there's Lego everywhere - on the floor, and the shelves, and the windowsills; and bits of things that she'd put together earlier and probably broken up to make something else. She had a whole washing-up bowl for the stuff.
Just goes to show: give a kid a brick, and eventually they'll learn to build a house (and they don't need electronics; or computers). i was just 6 months too early.
Isn't it funny how there's always time and money enough to do it WRONG?