I have a pleasant experience today exchanging my Note 7 in my Tmo store. I kept all the accessories including the S-Pen from the original phone. The associate did an exemplary service that I even tip him with $10, not that I need to, but I want to.
I wasn't able to get there until 1:30 pm. 4 associates working the floor and 6 customers ahead of me, 4 with Note related stuff and 2 buying other phones.
Sat there waited patiently and about 20 mins later, the same associate that took care of me when I bought the Note 7 came to get me and apologized profusely for the wait. He took a glance at my silver Note 7 that I was still using and ask if I was there for the replacement. He then told me the only available color they have is the blue, The irony of it, is I wanted the blue originally but it wasn't available and had fallen in love with the silver. Now, it's just the blue - heck, I'll take it! I handed him my original receipt and he was so happy mentioning all he needed was in the receipt, making his work easier and only took him less than 5 minutes to do whatever in their system. Went to the back to get the phone then ask me if I wanted to transfer the files to the new phone. I refused, told him I backed up my files in my home pc and I will do it at home (thinking it will save me time and his time). He transferred the sim to the new phone, and started peeling the plastic covering on the screen. I said no don't do that! He then looked at me and said he was going to install a new Zagg protector on my phone. Reminding me that my old phone got the Zagg film - front and back. He then mentioned it was also on my receipt. I was so impressed with his initiative and he did a good job and took the time to install it, despite by that time there were more customers waiting.
I've read some comments above regarding not credited for their returns, what not. The reason mine went smoothly and quick was, it was an even exchange and have my original receipt, nor I have to return a loaner as well. The couple (2 guys) who were being helped by another associate took forever. Their case: both got the original Note 7 that they returned at an earlier time and both also got the loaner phones. Their EIPs where showing both the original Note 7s and the loaner phones. Took the other sales associate about 30 min. to get in touch with customer care to erase those EIPs so he could issue them the replacement Note 7s. But in general nobody was aggravated or impatient and that sales associate did make everything right for those 2 guys.
Me, I walk out of there with my shiny new coral blue Note 7 with Zagg covers and extra accessories and an S-Pen.