I've owned this phone since February. I've been using it as my spare phone at home only. But I've grown to really like this phone. That's possibly because I'm also heavily invested into the Amazon eco-system. :) I've got the Amazon Echo, several kindles (The Kindle HDX 8.9 is my favorite device)
Anyhow, now that SwiftKey and Google Play services are successfully installed on my Amazon Fire Phone, I can honestly say this is the best value phone you can get on the market. For less than 300 bucks, 32GB storage, quad core. It's got good heft and excellent build quality. Anyone wants to get a feel of it? So far all my tech colleagues whom have handled it all like it. Pity Amazon didn't get a fair chance.
Excellent screen, excellent fonts. Excellent sound processing. There is a noticeable difference in audio quality compared to my Xperia Z2 when streaming to a Bluetooth speaker. The sound is warm and fuller. I don't know. I'm just growing to enjoy this phone the more I use it. Am typing this review on this phone right now.
I'm still using the default Amazon UI. The gesture controls grow on you. So much so that I even ended up mistakenly swiping up on my Xperia Z2.
What I don't like: The default keyboard. That's probably because I'm too used to the auto correct and prediction functionality of SwiftKey. I don't use flow. I'm used to back swiping for deleting. I also can't seem to find where the context switching button is. I'm used to quickly switch applications but on the fire phone... Where the hell is that?