I have put in a lot of time on the water and have yet to see one. The attacks are pretty amazing but I also read about some of the encounters that peopel have gone through and it's pretty amazing too. I read the one about the surfer up in Northern Cal who was just sitting on his board with his feet over the side dangling in the water waiting for a wave when he feels both his feet plant firmly on the bottom. "Wait a minute it's about 8" deep here how can my feet be on the bottom?" He looks down and he realizes his feet are planted right on the back of a GWS with a back that's about 4' across. Looks over his shoulder and see's a huge swirl behind him. Time to paddle like hell and never look back. Scary stuff.

JerryG