aren't your customers a pretty small niche compared to the most of the Apple users in the US? Most of the people will go to apple store if they need a fix for their device instead of going to a local repair shop which will void their warranty. So the argument about people wanting/or not to upgrade to a new device a pretty subjective to your specific customer type, no?

> "I recommend buying a refurbished 6 over any of the 6S line"

I would not, upgrading to "S" was the biggest performance boost I've had, compared to regular 6 - it's blazing fast and on top of that I can't imagine myself without 3D touch app switching, live photos and text navigation, those do help a lot at least to me and most of the people I know.