I know a couple of folk that have scared themselves ****less on flex wings after a purchase on ebay.
They were all rather qualified in flying terms. And they were all legal for jumping in and having a go solo.
But this whole thing of power on the foot, push to flare instead of pull and no rudder really is a recipey for a change of pants and multiple approaches and your bag of luck getting emptied.
Another one which was hilarious to watch was someone that had bought one of those para gliders and then strap a big fan on your back. Eventually it ran out of fuel and landed with a fence post stopping his forward velocity middle wicket. As one of the others said if you had aimed to hit it you would always miss.