Must admit I did have the offer to have a shot which i declined.
I just had to look at the collection of tent poles with a bath slung under to know that it would be twentys mins of saying "oh fcuk" every thirty seconds and a safe arrival wasn't a cert. And after seeing a engine failure in one on youtube they just don't glide.
They do look very good fun though and once I find one I can fit my arse into after suitable instuction its on my list of things to do.