For what it's worth, I met Daniels this summer at FanExpo in Toronto, Canada. He seemed very congenial, taking the time to talk with each person who was in line for an autograph. When it was my turn, we chatted for a few moments before he personalized his autograph to me. Then, when I mentioned that my two-year-old daughter was beginning to watch Star Wars, he grabbed another photo and addressed it to her for free (pic+autograph being about $40 or so). I thanked him, said it was great meeting someone from a film I'd been watching since childhood, shook his hand, and went on my way. Overall, he seemed very nice and did not rush, unlike other celebrities in attendance.
In between autograph sessions, he even walked around the convention floor to pose for photos with fans. Personally, I'd say he was one of the nicer celebrities I've encountered.