The New York Times reviewed the Amazon Fire Phone.
At its best, Dynamic Perspective adds helpful gestures that allow you to get around the phone more quickly. Snap the phone to the right while you’re in the calendar app, you see your daily agenda; snap left and the agenda disappears. But these shortcuts are never reliable; a lot of times you’ll snap and nothing will happen, because the app you’re in isn’t coded for gestures.
Other instances of Dynamic Perspective are downright annoying. Take Auto Scroll, which moves the text on your screen as you tilt the phone back and forth. Because Auto Scroll calibrates its scrolling speed according to how you’re holding the device when you first load up an article, your brain will struggle to find a set rule about how much to tilt to get the right speed. Often I’d scroll too fast or too slow.
Worse, if you put your phone down on a table while you’re in the middle of an article, the scrolling goes haywire and you lose your place. The best thing about Auto Scroll is that you can turn it off.
When you introduce a gimmick instead of making sure the feature simply works.