For advanced players, I don't think it will help as much as books such as Freddies banking books, but overall its the best all-in-one book on straight pool out there. Babe's book, Holiday's books,etc... were ok but very brief, not produced as well, and they don't cover as much.
Phil is a master of collecting information and putting it in a good format with about 90% coverage of whatever topic he's covering. I just don't have the respect for him as a player as I do Ray Martin or Grady so any top pros who put out tapes or books will get more attention from me. Some stuff like reading a pack for dead balls in 14.1 might be too complicated to generalize in a book anyway. Find a living legend and pay him for lessons.
The quality of instruction in pool has increased dramatically since guys like Robert Byrne, Ray Martin, Eddie Robins, started putting out quality books. The older instruction from Mosconi, Mizerak, Hoppe was for beginners and almost useless to anyone who's played for awhile.
Between the Accu-Stats videos (and TAR now, of course) and books by Byrne, Cappele,etc... its MUCH easier to get from a beginner to a B player level in much shorter time. Old timers had none of this and had to pay to learn anything, todays players can get Accu-Stat videos, some quality books, and know almost everything they need to in a very short time. Once they start pocketing balls well, players can become monsters who know almost all the shots in a few years.
For example, if a European pro wanted to become a better one pocket player, how much easier do you think it would be to order a bunch of tapes of Efren, Hopkins, Daulton, Cook, Fusco, Varner,etc... instead of travelling around the states trying to match up and learn the way guys did before all this was available?