I've used the ice cream attachment once and learned a valuable lesson: reading is fundamental! My mistake was that my batter was too thick and I couldn't figure out how to pour the batter into the mixer while the blade was moving and not make a mess. So, I stopped the mixer after I'd spooned in some of the batter. BIG MISTAKE. 

Per the instructions, you MUST NOT STOP the mixer once you've started pouring batter. I tried to restart it and the blade was stuck. I mixed the ice cream by hand intermittently over 30 minutes (which still worked amazingly well because it freezes the ice cream in the bowl).

I rated 4 on "ease of use" because I still can't figure out how to get the batter in the bowl without making a mess.