Yeah my repair nightmare saga last year would scare you senseless, I had assumed USA would be better with Samsung stores etc.
No, it's actually bad here too. I have my own as well. So we bought my mom a S6 Edge. It was having some sensor malfunctions and wouldn't stay powered on for more than a minute. We sent it to Samsung. They "voided" the warranty due to "liquid damage." The device was never dropped in water or anything. So I called Samsung when I got the device back, especially when I noticed Superuser was on the device, which never happened before. They said it came rooted to them. How can someone root an unrooted phone after it was shipped to Texas? They didn't budge, so I tried spending time unrooting it or making the phone usable for my mom. It worked for a bit and then like crapped out entirely.
TL
R Mom's phone had issues, Samsung didn't do anything, and I had to get her a Nexus 5X.
As for me, I sent in a Note 2 I got 2nd hand off Swappa in 2013. I was phone less for a good month or so because of their "warranty repair process." They say it's not 9-11 business days.
In addition, I had to get a refund through Samsung to buy my own device because the S5 had to be replaced so many times. I had to write the Better Business Bureau multiple times and call Samsung for a month straight before they offered a new replacement device, which had issues, and then I had to get a refund after the "one time new replacement." That was back in 2014.
Sitting down and thinking about it, I am not in the position to spend another $500 on a phone or something, so I think I am going to get a phone that's $400 or so and comes in a brand new condition.
As amazing as the S7 is, I kinda regret selling the S7 Edge and not the iPhone 6S Plus then and there because the Edge at least worked and gave me a solid experience outside of accessories and typing issues.
The choices are HTC 10 (free JBL USB Type C headphones that I would sell, but it's too much work and prefer not to do that), ZTE Axon 7, OP3, Nexus 6P, or Moto X (worst device support around these days.)