I got in on the $350 off iphone 11 pro plus "up to $850 back" for trade in. I have an excellent condition 6s, which is on the list as trade in value $600. I see a lot of bad experiences on these boards, folks getting scammed, getting way less back than they were expecting. Has anyone had a positive experience and gotten the full promised trade in value? I have to send it in next week, I am considering just not doing it. I wouldn't let the phone go for $37, and once they have it, they have it. There is no recourse. Thanks