Instruct: Classify Amazon reviews into positive or negative sentiment
Query: not very effective

we bought this for the back of our '97 acura integra because our 1 year old goes nuts when the sunlight hits him in the face while he is in his rearfacing carseat. Unfortunately, this shade doesn't block out much except for my view out the back window. The suction cups fall off about 20% of the time. the shade isn't big enough so there is alot of uncovered window space. When the angle is just right for the shade to block out sunlight, it only filters it a little. Still looking for a better alternative but haven't found anything else yet....