I flew one once ex82 - it was some sort of open day at Lasham in the mid-90s and various vintage gliders flew in the early evening. I was the last 'act' and took a tow to 3,000ft in a Grasshopper behind a Super Cub. It was fine all the time I was on tow, but I've never forgotten releasing the rope and then grabbing the bottom of the seat with my left hand when I looked down. For just a second it was a bit spooky.