Did a couple of trips in them on a Sqn exchange to Salon de Provence. One in the front and one in the back. My impressions:
You're bloody close to the ground. Makes you feel like you're going much faster than you actually are on takeoff and landing.
The periscope is a bizarre concept for an aircraft, but it actually works! Just as well as the visibility on landing is dreadful from the back.
It's underpowered.
It's good thing it has a V tail. A conventional fin would slice you in half if you had to bail out.
Control harmonisation is OK, but the aircraft feels a bit odd with those long wings. I tried some slow rolls and they seemed quite difficult to me. Having said that, it was very nice to fly in formation.
It's very noisy on the ground.
It would probably make a good glider.