I bought this attachment so I could make nondairy and low sugar ice cream for my family... I have an accolade mixer, which does not work with many of kitchenaid's attachments, but with the supplied adapter ring the ice cream maker fit perfectly (it makes me wonder if the adapter ring could be used to fit th glass bowl too, but that's another topic). The paddle fits into the bowl, and there is a plastic part that slides onto the rotating mechanism of the mixer. It is quite ingenious, and makes it so the paddle can spin in place when the tilt head is lowered onto it.
The bowl needs to be frozen solid, and the batter needs to be chilled all the way before using (the first time I skipped this step and poured the batter in only slightly chilled, and ended up with ice cream the consistency of a slurpee). The paddle needs to be moving as you pour the mixture into the bowl, and this can get a little bit messy if you are working with a thicker batter that does not pour quickly, I did get some drips down the side of the ice cream bowl trying to get it all in around the moving mechanism.
The mixing happens on low speed and takes 15-20 minutes. You will know it is ready when the plastic disk starts to skip, making a clicking noise, because the ice cream is now too thick to turn smoothly. At this point, the ice cream is the consistency of a soft serve, if you like it firmer, pop it into the freezer for 20-30 minutes.
For non-dairy ice creams I do not recommend freezing the finished product overnight as it turns rock hard (but would be great for fudgesicles). If you are making ice cream using heavy cream the extra fat content should keep it scoopable the next day without much trouble.
Overall this was a great investment for me, I've had fun testing it even in wintertime, and I imagine come summer this will probably get used daily. Wait for a rebate if you can, kitchenaid has at least a couple each year on attachments.