oooh NIGHT AND DAY!
normal icecream maker - doesn't really work in my opinion.
Ninja creami turns frozen fruit into the smoothest, creamiest sorbet (despite no cream being involved) - totally delicious (we like tinned mango here, but the tinned cherries were good, and fresh peach was amazing too)
every couple of weeks I make fresh gelato (took a while to get good at that - kept curdling it, but it turns out that if you liquidise it after curdling, it's still fine) after I read the ingredients on the one we buy and decided to try and avoid them.
Basically, you whack whatever it is (custard, fruit etc) in the little pot, freeze it solid, then the creami shaves it and whizzes it into smooth icecream. It's unlike any other gadget I have, and I can't think of anything that could do what it does.