I have twizywindows.co.uk, they're not bad, but they are what they are, basically a sheet of perspex.
Major thing is they cut the wind noise/chill and keep it dry when parked up.
I asked for it without the cutout for the door handle, have a remote door popper installed, but most of the time i end up just bending the plastic back to get my fingers to the door handle. Brought some rubber seals to beef up certain areas from vibrating and some extra velcro straps to better secure them during windy fast drives into work. They have scuffed the plastics and the 3/4 window, but oh well, as long as i can use it in the winter.
Being in the car design world I cant help but feel that there's a better solution but i do understand investment ££ and being a small market, I wouldn't mind betting the Renault boys have a really good full door design on their server somewhere.
TWY windows is what Sir Stirling Moss uses on his Twizy, look a good bit of kit but i havent seen any to comment on how good they really are.