OUCH! My 13" jag went for my hand for the first time about a month ago during a water change and he meant business! Gotta have respect for these monsters for sure!
My male has almost gotten me a few times, but only when feeding them. My female is much more defensive than he is towards me. Towards other fish, he's the more aggressive one.
He is not the most aggressive dovi I have seen, but he can get pissed off if you are around his babies.
I currently have him on a diet, trying to slim him down. Some of the other breeders seem to think he will get more aggressive as his weight comes down.