I have an ugly black case on my phone, looks are secondary. I'm a function over form kind of guy. If it's pretty and 'feels good' but doesn't perform, it's worthless.
I like the quick swipe up from the lock screen to enable the camera, which even works when it's passcode protected. I also like using the volume down key for taking pictures vs. fumbling for the on screen button.
I like the rock solid OS which very rarely has a hint of lag, much better over even Android 4.2.
The resolution on my iPad is absurd. I love it.
Battery life in this phone is great. 'Bad' battery life in this phone is still better than 'good' battery life on my old Android phone.
No "this app is not compatible with your device" messages when trying to download an app.
I like the implementation of Photo Stream. Google has tried something similar with Instant Upload tied into Google Plus, but it's not as well integrated and seamless as Photo Stream.
The location history of photos, letting you sort photos by what city you were in, is absolute genius.
iMessage is really nice when you also have an iPad to send/receive texts with as well.
Facetime is also very well implemented in how easily accessible it is.
Siri, despite not being perfect, is still very good. I use it a lot for setting reminders and alarms, and quick check of the weather in the morning as I'm getting ready for work. The speed is not up to par with Google's implementation, but hopefully it will be improved down the road.
I also like the fact that Google readily makes their services available to a competing platform, making a heavy Google user able to choose between either phone and not feel cut off.
The use of gestures on the iPad is very well done.