Agreed re the Players Guide having some nice clarifications - e.g., it clarifies the "no spam healing" rules. Not oodles in my view - I'm a completionist so my "standard" for buying things may be too low for some. If you looked up stuff here on boards and were happy with your own fixes nothing too vital is there.
That said, you only need ONE copy of it and the Players Guide as pdf is fine as unlike boxed sets etc. nothing on cards is missing.