Display: Text is very crisp & readable - I very rarely have to pinch/spread to increase text size. I haven't installed any screen dim apps yet - I'm still experimenting with brightness controls.
There are no text labels for menu icons - you use the 'tilt' and 'peek' features to make the labels appear - part of the Dynamic Perspective effect. If you look directly at the Home screen, you just see the carousel icons. Tilt the phone and a top menu strip floats into view, displaying battery life %, connections, and time of day. The text 'floats' on top of the home screen - you can actually peek below it. Any time you encounter an icon - just tilt to find out what it is or does.
This gives an uncluttered screen appearance, but I often wish there was a 'tap to appear/tap to dismiss' function for these labels. You can also have the phone read the labels to you (Accessibility features).
Dynamic Perspective: One of Amazon's selling points - simulated 3D displays - courtesy of the 4 front facing cameras that track your face/eyes. I have little/no depth vision - and cannot use 3D glasses at movies, etc. so I was astounded to see 3D on this phone. You can tilt and peek behind icons, look underneath text, etc. The included lock screens are mini 3D masterpieces - whose appearance changes as you change your viewing angle. You can use this feature to play games without hands - your head movements direct a figure's actions on screen. The phone 'learns' where your eyes are looking, and coordinates the game pieces movements.
I handed my phone to a friend to show this feature - and there was a brief lag time while the phone adjusted to the new face - before they could direct the figures on screen.
Firefly: The other Amazon selling point. It works great for music & film - your phone listens to music, and watches & listens to a film you are watching - and then identifies it and gives you purchase options, IMDB information, etc. I tested it on my old TV watching TCM - kind of spooky.
It can also read bar codes & QR codes.
Very accurate at identifying name brand items - food, beverages, cleaning supplies, etc.
Not very good at objects without labels or packaging - even if they are sold on Amazon. For instance, I scanned my cat's stainless steel water bowl - bought from Amazon - but it was not identified. There is a feedback feature to upload your scan to Amazon to add to the data base. I can't imagine what people will send them!
This makes your phone the ultimate shopping tool - scan => click to buy from Amazon (since you are using their phone, you are a Prime member - so shipping is free -- talk about positive reinforcement).