Haven't read this since it was released waaaay back in 1991, and Audible offers unabridged readings of the entire series. At 10-11 hours per book, all seven nets you about 2 1/2 days of binge listening or spread out for long trips, etc.
Will assume others have done a much better job than I ever could in discussing the content, but will say this one was more of an interesting read (or listen) than the last few in the series. For myself, for several of the books I thought too much time was spent discussing "gaming" rather than moving the plot along, and as much of this story takes place away from the standard gaming environment, a lot less time is devoted to play-by-plays.
One item of interest Post 1991, as this is now 2017. When I read the Authors Note back in 1991, the Author mentioned that this would be the Final End to the Apprentice Adept Series, although it was possible that the Frame of Phaze might be revisited in another of his series. At the time, he hinted Phaze might appear in the "Mode" series he was then beginning, but this never came to pass. Phaze did make a minor comeback in 2004 as a partial backdrop in the 27th Xanth Novel "Cube Route", where some Xanth characters briefly enter Phaze for parts of chapters 5 and 6. There appears to be no mention of how long it has been since the events of Phaze Doubt, and none of the known characters from the Adept series are mentioned. Still, it was a brief return to Phaze after a 13 year absence. Hmm.. 2017 is again 13 years later than 2004, so perhaps it's time for Phaze to make another appearance? :)