I have found that this phone is a lot easier to use than my S4, which I really liked. The size is very manageable, not too big, and even with a Defender Otterbox case, everything feels right. The buttons are easy to get to without fumbling, the screen is very sharp. I usually use 1.5x reading glasses, but this screen I almost don't need them.
At first I resisted because of no provision for an SD card, but now have been sending everything more cloud based, it has not become an issue. I recommend fence sitters to just go ahead and jump to your carrier's store and get one.