We've got the grinder and the sausage stuffer attachments, but ended up buying dedicated appliances for that because the KA struggles if you are doing large quantities. It's fine for small quantities though.
We've got the vege slicer/shredder attachment but honestly hardly ever use it because of the clean-up factor. If we're doing large quantities of something we'll use it or for something like grating fresh horseradish as neither one of us really wants to sit there with tears streaming down our face as we hand grate it
or we'll simply use the food processor grating blade.
We've got the ice cream maker too and have made ice cream a good many times. It comes out a really soft serve and you either serve it the instant you take it out and have kind of soupy ice cream, or pack it in a container and put it in the freezer for a while. The unit has to be in the freezer at least overnight to work well. We used to keep it in the deep freezer unless we were running really short on space.
Obviously we've got the spiralizer now that has yet to be tested.
I'd suggest you download the manuals for the KA and the attachments from the Kitchen Aid web site. You'll need to know the directions on how to use them safely and properly because there is a trick or 2 to using them.
Also, be careful and don't go crazy with making dough. I made a triple batch of pizza dough 1 time and ended up stripping a gear. DH was not happy with me since he ended up having to take it apart and put it back together after I had ordered the gear. He's good at fixing things, otherwise I'd have had to pay somebody to do it. There were LOTS of little parts.