This is in the same boat as the Basic Edition Players Handbook. It draws info from the Basic Rules converted to the d20 system, as well as the Empathic Sourcebook, Dark Races, Dark Tek and Proto-Dimensions. Actually, I didn't know about that last one until I got the Masters Edition - the whole section has been cut out of the Basic Edition. This editing simply does not do the concept justice. The worst part is that until you see the Masters Edition Referees Guide, you simply do not realise just how much material you are missing. As I said, an entire chapter is simply left out.
Refer Back to the Basic edition Player Handbook for my comments on layout - they apply here too.
Style: 3 (Average)
Substance: 2 (Sparse)