
I had reservations at first about Swappa because I wasn't 100% confident in an independent seller. I've been burned in the past by selling a pair of gaming headphones on Amazon in which the buyer claimed the item was destroyed when he received it. He never returned them and Amazon issued a full refund. In any marketplace dealing with pre-owned goods, there is always the possibility of a transaction not going smoothly. Swappa does their best to prevent people from being ripped off and try to make sure people receive the device as described. PayPal buyer protection is also a good thing as you have the option to reverse the transaction or file a dispute. Your money is safe as long as you play by the rules (including reporting within a certain amount of days).
I payed close attention to the pricing on Swappa and what the sellers were offering. I went with a corporate seller who had an established account and a high volume of positive feedback (1000+). Granted they use stock photos of the device, but their description of item condition and warranty terms are very detailed.
This S7 Edge pictured above ended up being $475 (unlocked for $15) and arrived in great condition. No cracks, chips, dings or deep scratches. There was minor screen scratches, but I figured that they would occur anyway because I don't roll with a screen protector. Why worry about a flawless screen and making a scratch when it is inevitable? A few tiny scratches cant be seen when the screen is on. The tradeoff is about $275 which I can certainly live with.
So the device is AT&T branded, but unlocked and free from anyone else's NEXT agreement or account. It's paid off and if I choose, I can take it to my local AT&T store for an evaluation and enroll it under the insurance plan.
Additionally, I submitted a request for Samsung's "Try on the Future" for a free Gear VR, and received it 2 weeks later. I will certainly attest that great devices can be had for hundreds less by going the Swappa route. Good luck.