I did one of these a while back, I can't be bothered to do it again now. I think it was the same tickle one, and I got much higher than I would in reality. They over estimate quite a bit, I'm not stupid, but I certainly am not IQ of 140+ that it quoted my last results as.
But I agree with Frenchperson (this time only!) in that they do not indicate true intelligence. A lot of those questions were based on mechanical reasoning which doesn't necessarily indicate a person is bright or not.