I bought the two piece version (front and back). It was packaged nicely and included instructions. While I'm not sure if the instructions are really needed, it's pretty self-explanatory. In any case: Regarding the product: The front is used immediately and you notice the difference immediately after installation. This reduces the amount of light coming in and will definitely affect the warmth you feel when sitting in the sun. The back is nice because it doesn't cover the whole back. The OEM version covers the entire rear sunroof and rear window. The complaints I've read are that you can't see anything due to the OEM sun visor so you have to remove it or create an unsafe driving environment. This product solved this problem by developing a sun visor that allows you to see through the rear window. It also reduces the amount of light and heat entering the vehicle. 5 Stars! If you were to buy this from Tesla you would be paying a little more and you wouldn't be able to see the back, it's definitely worth the price and it fits great.
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