I traded in my black 7" Fire 2015 for a sage 2019, and I am so glad I did. The main reason I traded in was the battery life wasn't what it used to be, and with the pre-order offer, how could I go wrong? I received $10 for my trade-in, 25% off a new tablet, plus a $10 app store credit. The new tablet is double the storage (I still put an SD card in it), a beautiful color and a newer OS.
I am a 'The Simpson Tapped Out' game addict, and for a while, I couldn't play as often as I liked on the old tablet because there was an update to the game that didn't jive with older Fire tablets and caused game issues. I switched over to my Nook Tablet 7" 2016 to play, which was a challenge in of itself. Thankfully, my new Fire finally arrived on June 17th, and I am back to playing TSTO in full force again! I play a couple of other games, too, as well as surf the 'net, and read books.
I haven't found any issues with battery life or with it getting hot like I have read in other reviews.
The only thing I was a little bummed about, which is partly my fault for not really looking and just going by what I read online is that not only did the speaker move, but the headphone jack and volume buttons switched spots, so my Poetic Turtleskin case technically doesn't line up, but for me personally, it's OK because I don't use headphones with this tablet, and I can still feel for the volume buttons. I also have a Fintie case, which is what I use the majority of the time, and just a little bit of the left volume button is covered by the case, but it doesn't interfere with its use.