Its been mentioned in a couple of threads before but a quick rundown for those not bothered to search
Pros
-Heel stiffness never softens with age like conventional boots which gives amazing cut
-protects your feet from gnarly stuff (good if like me you hurt yourself on nearly everything)
-because of the two part boot combination they last twice as long as most conventional boots and you can just glue it back together 15 times
cons
-walking in them on sand is so dire
-putting them on and off can be annoying and it stops you swapping boards mid session
p.s im a team rider so everything i probably said is a lie