i have some, although a little tatty on the seals, they dont leak thou

, pretty good for ppl in the back imo, i always get a little claustrophobic if im in the back without an opening window :-\ + u have the bragging rites to say u have rear pop outs lol
look pretty easy to fit 2(was already on mine) is just a case of screwing the fastner and hinges to the front and rear of the window