Not as elegant and a bit fiddly to "install" the phone (which could be a reason not to use it as often as we want to) but this could be a "long"-er term option if you think you'll be staying with the Apple (lightning) ecosystem:
It's not specific to a form factor so may provide a little bit more longevity (if and when they move out of the current iPhone 6/6 Plus format/size).
Have been mulling this but haven't bitten the bullet yet.