I haven't even own mine for 3 yrs yet. I still have 2 weeks to go. Still want the $600
I just had my 2.5 year old Surface Book replaced at a local Microsoft store. Warranty expired after one year of course... and my 3 year anniversary of purchase was coming up in November 2019. I purchased online via Best Buy and all I had to show was the email proving delivery (I don't have the actual receipt)
The store manager took one look at the yellow burn-in lines on the LCD and immediately provided a replacement on the spot - no charge.
I had all my data backed up via oneDrive / Dropbox so I just initiated the full hard drive wipe at the store and got all data back on when I got home.
Maybe I was lucky.
Mine will not even come on anymore. When I plug it up it starts smoking. I have take my surface to the Microsoft Store in Vegas and New Orleans, same results - $600.