My #2 son met him in Orlando not long before he was killed. Had a backstage pass and a friend that knew them. They hung out a while, talked music, how-to playing... said Darell offered him a signature "Dimebag" guitar if he'd just send him a letter and address later; said he had a garage full of them.
My son was pretty impressed with how kind and friendly the guy was.
Never really heard anything bad about him, so RIP.