I've sold two different devices to Gazelle, and two through Glyde. Both services work very well, and I've had excellent experiences with both. Gazelle's processing has been a bit faster (a few days, because Gazelle puts my money directly into my bank account, where Glyde deposits into my PayPal account, where it is then transferred into my bank account), but I've received far more money selling through Glyde. As I write this, Gazelle would offer me $510 for my iPhone 6+ 128 gb, versus $630 from Glyde. If you're in a big rush to sell, I'd recommend Gazelle. If not, Glyde's the one I'd use. Highly recommended!