I have a Kindle Fire TV and the new ATV4. I only have one HDMI port on my TV, so I have to physically switch the cable over. As a result, I tend to stick with whichever one is plugged in unless I really want to change. Although I much prefer the Siri remote (I find myself trying to use the Kindle remote as a trackpad, and I half lift it to my mouth to ask it to skip forward and then remember it can't) I'm spending more time with the Kindle than the ATV. This is mostly because the ATV still doesn't have iPlayer or Amazon Prime. (Will it ever have Amazon Prime?) The only thing ATV has that the Kindle doesn't is iTunes (which I rarely use as you have to pay for content) and Now TV. I really like the Kindle and if it had an ATV4-style remote it might be a killer device for me.