MIL is Italian and loves to make her own sausage, so a few years ago we bought her a heavy duty grinder. She makes many pounds at a time.
So, I borrow it from her from time to time. For me, I don't use it for many things as I don't often have it. Usually I make Italian sausage or breakfast sausage. I do this both to get the taste I like and the grind. I prefer a slightly finer grind than some people for both. Not like knackwurst, but definitely finer than what I often get in the stores.
For both, I use pork butt. MIL is militant about getting all the little vessels and other parts (goombahs) out. I found a webstite a few months ago that had a great method for sorting the meat.
I place all meat in one pile, slightly fatty in one pile, heavily fatty in another, and then all "good" fat in another. Some of the fat just doesn't feel right, so I dump that. Someone who knows what they are talking about will probably have a term for it. The nice soft fat I keep.
Then when I grind it, I grind them separately. It allows me to control how much of what get puts in. I also always grind some fatback along with it to add.
You'll have to practice if you decide to make sausage regarding what amount of fat you want. Less than 20% and it's very, very lean. But, some sausage is 50%. That's tasty, but too much for me. I usually keep it about 35% or so.
I have often wanted to make other sausage, so would use a grinder for that. I did have it once for sausage, so made some burgers while I had it. I used chuck for burgers; if I had it more often, I'd also use it to grind sirloin with some chuck for meatballs or meatloaf.
There are so many types of sausage. I can easily see making lots of those. I haven't bought it, but several people here have had such wonderful things to say about Charcuterie - if I had more time and wanted to do more in this area, I'd definitely take a gander at this book.
Have fun and enjoy.