I think so. I don't think he's completely accurate, but I think he gives a good ballpark figure on players.
The new book is supposed to have more analysis on more positions like running backs and O-Line play (before it was just QB's, DB's, WR's, and TE's). I thought the old one was worth $50. The new book will have more info and only costs $30 this time around.
Go to the footballoutsiders.com web site for the Prospectus book
It's a similar type of book as both were influenced by baseball's stat guy Bill James. Joyner's is more of a pure scouting report whereas Pro Football Prospectus is more pure, stats and number crunching. Again, I don't think it gives a completely accurate picture, but it gives a good ballpark.
I'm not afraid to say it's well worth $13.
Rich.........
even if Aaron Schatz doesn't like me.