I agree with the previous commenters, the ShopSmith is great for saving floor space, but mediocre, at best, for other tasks.
I own one, since my father-in-law passed, and I grew up with an older version my father had/has. My FIW stateed that the table saw was woefully inadequate, and impossible to adjust for true cuts. From what I see, I concur. I have a Lowes purchased Bosch portable table saw that is many times better than the SS.
The drill press, disc sander, and the lathe on the SS are quite decent. I have a small $100 drill press, and use that 99% of the time - setting up the SS is a pain, and I can count on a few fingers the number of times I needed a larger one. When I do need larger, the SS fits the bill quite nicely. I never used a lathe, so my observation is based on my FIL's statement and his completed work done on the SS.
I can't speak to the planar and jointer attachments to the SS, as I have neither. I do have separate machines for this from my FIL and never used them. I am taking a few intro classes at my local Rockler to learn how to use what I now have.
My FIW had a few routers and a custom router table, so I can't speak for the router of the SS either. I can't imagine it being bad, but the small table it would offer is likely not ideal. I built my own router table - if you Google the "Ultimate tool stand" that is what I built for myself.
Summary: SS is great for small spaces, and perhaps tight budgets if you get a good deal with all the attachments. If you have a larger space and budget, second hand used components for what really interests you will be the best.