For the money, it’s a fine little tablet, and it’s truly amazing if you’re already part of the Amazon Prime ecosystem.
As Mark mentions, you can sideload Google Play into it, and start installing apps from the Play store, in <30 minutes.
It has it’s limitations - the CPU too damn slow, the camera is pretty much crap, and the modifications that Amazon makes to turn the AOSP distribution of Android into it’s proprietary “Fire OS” cause it to be slightly incompatible with a very small number of apps (you cannot use replacement launchers, for example).
But otherwise for $40, particularly if you then cram a 128GB SD card into the expansion slot, you get a great little tablet for all sorts of purposes, with the Google Play hack installed you can pretty much run anything you like (I use mine with a little Bluetooth keyboard/case I bought for it to run Microsoft Office 365 Android app suite that makes it into a tiny little laptop), and the screen is nice and bright and the quality is good enough and the WiFi is fast enough for Amazon Prime movies, Netflix, etc.
