After reading his biography, I was left with two impressions. One the genius that he was in terms of the asthetics and attention to detail that turned into the amazing products we have today. The second impression is that this obsession made him not a great man when it came to relationships, including his family and co-workers. Therefore I wonder about Tim's comment that he was a great friend. Obviously having never met the man I cannot really comment, but anyone reading his bio would surely at least raise an eyebrow at the "great friend comment."
Well, in the Isaacson bio of Steve, there are quotes from some people who said what a great friend Steve was, how he was there for them at bad times etc.
I can't recall exactly who said it, but obviously there's a lot we don't know.