Well, apparently he is still a nightmare. The Grammys want him to replace the 86'ed Janet Jackson for the opening act, but apparently his demands are thwarting the committee (or whoever hires these people for these award things)- he has a list- limos, hotel rooms, special things for all his entourage- and apparently more over the top than all the other celebs...so one can only imagine.
And if you watch the Driven documentary on Carmen Electra on VH1, they give you lots of dish on Prince. How he basically locked her up at Paisley Park in Minnesota while "launching" her career. Each night he made her wait up for him in full war paint (you know lashes, lips, etc), full done hairdo, bustier, thigh high stockings, heels, so when he got home he could do her; she said sometimes he didn't get home until 4ish. His first video he did for her 'conceptually' was a number where she sang, but basically did a striptease and danced on a pole. High concept, but her debut album flopped, he dumped her, and moved on the next hottie he could mold.
He may be a freaky high heeled Napoleonic Svengali, but there is no argument that his music from the 80s is magic.