iPad 1 not so good
I have. 64GB original iPad. ToMI 1 runs shakily. You need to kill all apps before launching it. It takes about 4 minutes to resume a game. It's still stuttery after that but reasonably playable.
The other kickers are it does not save the game when you hit the home button, it forgets stuff, like picking up the bombs, and worse is after completing the map through the jungle, X does not appear to help me return there. That last seems like a bug/glitch.