You can program your swiss with just a regular subspindle lathe machine def in Mastercam lathe. I would only look at swiss expert if you really needed your posted programs to be ready to run with no editing. You would have to weigh the cost of the new software vs how many different part programs you are going to be making I guess. I dont write that many new swiss programs a year so I just stitch them together by hand.
Tsugami gives away programming software with their machines. It is good on the different funky codes and stuff, but for chucker work at least the machining strategies were garbage.
Dont forget, you will need a post for your machine. Any money spent on swiss cam would be a waste without a post that generates a program that needs no editing. IMO