This is such a satisfying piece of Doctor Who and Big Finish memorabilia to own. Having these four scripts at my fingertips with insights from their authors, seeing what lines were cut and how things changed throughout the production process, is just so wonderful.
And there are two little bonus treats I loved as well; the original draft for the first 1.5 episodes of "The Eye of the Beetle" (the original form of "The Eye Of The Scorpion") and the first episode of "Dark Rising" (the original story planned to introduce the Master to BF, with Anthony Ainley in mind rather than Geoffrey Beavers).
Other welcome extras features include scripting notes, story outlines and even trailer scripts.
I highly recommend this piece to any BF fans. It's a genuine delight to own and the extras just set it right off. I will certainly be looking out for the other three volumes.