The Lee LoadAll is perfect for slugs / buckshot.
It's fine for shot as well unless you shoot 400 rounds a week or something.
It's not as convenient for 3" shells because you have to judge the amount of pressure to apply for the crimp. For 2 3/4" shells it crimps great.
It leaks powder when using ball powder like W 540, it works great with flake / extruded powder like 700-X. With Slug / Buck loads you might be weighing or using a seperate powder measure anyway.