Here's my experience using the Visa card Benefit Services extended warranty for my Nexus 6p which had the early shut off issue.

Important: make sure to tell Visa that the issue began occurring AFTER your original warranty expired. Otherwise your claim will not be valid.

My early shut off issue began occurring after my Google warranty expired. Long story short, since I purchased the phone with a Visa card, their extended warranty program covered 100% of the cost of the phone including tax, and they also reimbursed me the money that I paid a tech to check it out. After the claim was accepted, the next day I had $550.19 deposited into my bank account. Here's some more detailed information for anybody with this benefit:

• gather your card statement which reflects the purchase of the phone as a PDF document.
• gather the receipt from Google Play store or wherever you purchased it in PDF form. (Hopefully you still have it an email like I did.)
• gather your original warranty
• call around to local Tech shops and try to find someone who is already aware of the Nexus 6P boot looping and early shut off issue. If you're lucky you can simply pay them to write up a diagnosis stating that the phone is non-repairable at no fault of the user, and you can even ask them to reference the fact that the issues are subject of a potential class action lawsuit. You can probably do all this over the phone and they can simply email you the document.

As I recall that is all I needed. Note that you have to finish the claim process within six months after starting the claim. I really hope that this can help somebody.

Edit: oh yeah one other thing, this won't be applicable to most of you. The card which I used to purchase the 6p was lost and replaced with a new card prior to my opening the claim. That caused a bit of a hiccup because they needed number from the card I actually used to purchase the 6p. So if that happens to you, your old car number is on the bottom of the card statement which has your 6p purchase on it. At the top it will only show the last 4 digits, but at the bottom there should be a string of digits and among those digits is actually your full card number. I never knew that.