I finally got around to reading this book in a spasm of Trek-related reading. It's been about 35 years since I read Whitfield's "the Making of Star Trek," which I eagerly devoured at the time. I was hoping for a similar nostalgic rush from this, but it never really happened for me.
Of the two authors, Justman was the more important player creatively, while Solow worked on the business side. The story here is far from complete, but is nevertheless interesting. There are many stories of set building, uniform fittings, budget cuts, ego issues, and script procurement. Justman was an overworked, likable jack-of-all trades on the set, while Solow was the lubricant between the show and the network and studio brass.
I didn't find the book at all dismissive of Gene Roddenberry, rather it was mostly quite respectful of him. I think some of the creative folks that were still around, such as Dorothy Fontana and John D.F. Black, could have added some much needed juice and color (unfortunately, others like Bill Theiss and Matt Jeffries have left us).
Overall, a mildly interesting read; it's subtitle might have been "The Nuts and Bolts of Keeping Star Trek on Time and Under Budget." Nothing controversial, nothing very intriguing. Ms Fontana, your memoirs please!!!