Ok, received the new HD 8 Fire this morning (thanks, Prime Now, got it for under $55) and just finished playing a little Tapped Out on it!
Oh my, it's way faster than my nearly five year old iPad. I can scroll around town so quickly. My town actually feels smaller because of this! I scroll from one end to the other in seconds. And when I use the teleporter I'm instantly at the other one, no flash of white for a second.
The downside of course is the screen size. Everything is way tinier. The details are lost. And some things are harder to click on. For example, I have a teleporter near the Simpsons' house. Nearby is the Insanity Cauldron. When totally zoomed out I can't seem to register a tap on the teleporter, it either picks up the Cauldron pepper that's kinda in front of it or nearly things. I never have this problem when zoomed out on the iPad.
Of course, this is all relative. People who go from a phone screen to an 8" screen feel freedom on the "larger" screen. For the time being though this will be a good backup device and one to use when traveling, etc. Eventually I hope to get a new iPad though (maybe when the newer ones come out in March or so).