The Amazon Firee TV is an substantially popular running system, and with valid reason. Its price ($100/£65) is remarkable considering it offers 4K running, and its 2GHz quad primary processer indicates that it's a quick and sensitive system.
There's a big disadvantage to the Amazon Flame TV though, and that's its unique use of Amazon's own industry for setting up applications. This implies that in order to set up Kodi you have to carry out a procedure known as 'side-loading'.
This isn't particularly difficult, but if you're someone who doesn't consider themselves to be officially oriented then there are better alternatives on this list.
If you're willing to go through a a little bit more engaged procedure to set up your system, however, then the Amazon Flame TV is a total deal.