At a price of 199 euros or 149 euros as it was temporarily offered but gives a good smartphone that's better than most phones at this price.
A gripe there are: The App Store Amazon has significant gaps. For "app junkies" the phone is nothing. But there are missing also apps that are simply useful and are also widely used; for example, lack the DB Navigator app Deutsche Bahn or the BlackBerry Messenger. Some of it can be covered by the mobile websites, otherwise not. The mobile phone ticket Deutsche Bahn requires now z. B. the app.
It is quite possible to install the Google Play Store by installing three APK files. However, I have not tried yet, so I do not know if it is possible with any software version. And I also seems to be doubtful whether the system itself is still safe or somewhere doors are opened that should stay better.
For some determined important: The Apps WhatsApp and feedly are available, the apps of various TV stations can be found in the store Amazon.
In addition, there are always offers where numerous apps from Amazon are free.
I welcome the quality of the camera as well as the speed of the system. The hardware is high quality and also well made.
Operation via the carousel is getting used to but not bad since it is possible to make all apps easily view.
Innovations like Dynamic Perspective, one need not necessarily, but it is a unique selling point, which is perhaps even further.
Tip: Turning off this feature saves a little power, at least my feeling after.
The battery life can I find fine.
Binding to the Amazon services should indeed be known to every buyer. I feel this is not a disadvantage but as a property that must always be assessed in itself.
The call quality is absolutely fine.
The integration of e-mail accounts, social media accounts like Twitter or Facebook is straight forward.
Overall, there is a price for the currently-quality and absolutely good phone (as of April 2015; the development continues of course, in half a year like it again look different).
Updated on 05.15.2015:
After it was pointed out in the comments that the web app is also available for the fire phone I checked that and the app has made the cloud ("bought" I had them already, but they could not be installed) can be installed , It also works flawlessly, runs fast and smooth.
Nevertheless, there is now indeed many apps, also sufficient for me. But I'm not a "app junkie" and often use (mobile) websites. For users to use the many apps or need a certain app apply in my view: check beforehand whether there is everything that you want to have.