Quick question for the group. I already have PMBOK 7 from when I started studying last year. Now that PMBOK 8 is out, I'm wondering if I need to buy it too.

I'm on a tight budget so don't want to spend money if I don't have to. Are the principles mostly the same? Or is the shift to Performance Domains significant enough that I'm studying outdated material by sticking with PMBOK 7?

For those who've seen both editions, is PMBOK 8 a nice-to-have or a must-have for the new exam?