Always happy with my iPhone 5 device! It might not have the flashy specs of the Samsung's or the HTC's, but Apple is always incredibly reliable in terms of performance, smoothness and the graphical beauty. Had the 4S and briefly stepped out to a Galaxy III but after that awful experience, got back into Apple world. The organized nature of iTunes in sorting music, is also one big plus.
Eagerly awaiting the iPhone 6 (didn't jump the bandwagon into 5S, which was a slightly incremental upgrade). Lil' disappointing that Apple has sucked up the the "larger screen size" hype, but still their devices with their OS (and its stability/fluidity) should still make it a great experience. Hope Apple can step up on the batteries, which they are working hard on right now for their upcoming installments.