This is my first apple device. Iam sharing my experience after using the device for 3 days.
Build Quality is superb.
Display is very awesome.
Touch ID is great and works well all the time.
Very slim( 6.1mm)
I played the games Iron Man 3, Candy Crush Saga, Stick Tennis, Real Racing 3, Sonic Dash, 300 Game, Pirates, Bike Rivals. All the games worked really well. I havent seen any lag. This is awesome product and looks classy. Completely satisfied with my purchas. I hope this helps.