I had one back in the 1980's, and flew it in 2 WGCs. I'm 6'2" and about 200 Lbs plus chute. Comfort was fine with the seat back removed, but due to sitting so far back, the rearward visibility was limited by the fuselage and canopy frame. This caused me issues with situational awareness in the huge 50+ glider WGC gaggles. To help with rearward visibility, I installed 2 round convex mirrors ( about 2" diameter ) on either side of the instrument panel glareshield. This helped, but with the disclaimer that if I could see a small glider in the mirror, it meant that someone was really close under or behind me. Maybe this situation is now better with FLARM, but the mirrors will still help if you plan on flying along with any other gliders.
RO