|Well, if you want insurance then deal with Acer. |
If you want to save money then you need to be proactive. Call or email the company you are considering and ask questions.
The link below is just one I chose from the first link. They seem to know what they are doing.
Buy with a credit card and get a confirmation the screen will work on your EXACT model 5517. Also, ask them if they have instructions on installing.