The Lee Load All is a fine reloader, especially for mixed loading. The troubles you might have are related to charging buckshot and slug loads. The pellets and slugs must be loaded by hand, but likely your powder charges will be bigger than the largest bushing. So you have to load by scale.
Last, the crimp will usually be good, but not perfect. Seems like working on my technique has made that better.
Still, I find it quite easy to load 100 slugs or 100 rabbit loads. I plan to try buckshot too.
On the other hand, if you plan to load 100's of rounds, people find used MEC 600's under $100 ready to load more precisely in terms of crimp and I would bet an adjustable charge bar might throw heavy charges.