Has anyone installed or seen installed the sunscreen accessory that Volvo offers for the rear door and cargo windows on the V70 wagons? We am reluctant to tint the windows on our '02 XC, but we would like to cut sun and heat in hot weather (for the dogs, in part). These are spendy items (about $114 discounted). Are they functional? Attractive? Easy to install and remove? Or a permanent install?<P>Any information anyone has about them would be greatly appreciated.