My 2013 is "old" and is probably worth 37k or so... i love that friggin car. Nothing wrong with older models if inspected properly. Infact, I recently rented a new AP2 for a trip and hated it, it was so tame compared to my P85.
Specifically? The QP is all one piece of paper thin aluminum, so it crumples/bends easily. First problem is finding an aftermarket one thats not completely messed up from someone else hitting it OR removing it. They are NOT easy to remove correctly... infact they werent designed to be removed at all. I wish i still had mine to take a picture, there is a thumb sized "lip" around the entire part to-be-welded to the car. When you pop those welds you're left with dozens of holes all around, think like punching holes in paper along the margin. Re-installing a QP is not a weld job, its a cement/rivet job. It will literally never look the same, mine doesnt. On top of the fact Tesla wont sell you one you HAVE to go aftermarket. Any number of things can go wrong with shipping a QP from a supplier, including UPS mucking it up by putting it down too hard.
I'm keenly sensitive to QP problems as you can tell, it literally DOUBLED my collision estimate when they said they wanted to replace it. Absolutely maddening.
Enjoy this professional install of a QP: