i would not drive a car without it. When it comes to clear bra, installation is the key.
All films will change color over time however if properly maintained then you will not be able to notice the difference. I have had it on white car for over 2 years with no yellowing, i have it on black car, no issue.
This is a question no one on the forum can answer. Best is to ask the shop you are getting the work done to do a sample on your car. Also ask about warranty. If those two checks out then you should have no issues what so ever.