My experience is coming from using the previous generation Kindle. In many ways I like the new features like the flush screen and waterproofed design but there are a few design flaws with this new Kindle.
Negatives: 1. the power button was moved to the bottom and this can cause the device to accidentally turn off while placing it on a surface like a treadmill. 2. Glare - this model has more glare than the previous one because of the glass screen. It's pretty noticable to me and distracting. 3. No bluetooth. I dont understand why the US version has audible support but not the Canadian one. 4. Contrast seems to be worse, text is not as black as the older model when the brightness is turned up. It causes the text to look blurry when reading in low light conditions.
Positive 1. Good battery life. 2. Sharp text when reading in good lighting conditions. 3. Inverted mode. 4. Waterproof. 5. Seems to be noticeably faster when opening the store and navigating around.