Note8 back cover replacement a success!
I dropped my Samsung Galaxy Note8 and the corners of the back glass cracked
I used the iOpener to heat up the adhesive on the back of the phone, and it took a bit longer than expected to get the adhesive to come loose, but I have a low wattage microwave, so I don't think I heated up the iOpener enough at first. The back cover cracked quite a bit while I was removing it, which made a bit of a mess. Overall, the repair was simple and saved a lot of money.
Get the iOpener kit, and make sure it's hot, not just warm, before you use it. Have a vacuum handy if you're working with broken glass screens or covers.