We run SPSS version 16 on Mac, but it is a PITA as they will not support anything beyond 10.5, so those of us on Leopard have to hack our Java configs so that SPSS uses Java 1.5 instead of 1.6. We need to get up to SPSS 19 but the cost is a bit of a problem (around $700 per user).
We used SPSS at one of my first post-grad school jobs. I hated it with a passion. Trying to do a Tobit model in it was THE biggest pain in the ass ever.