If you like reading books by a "Self Appointed Expert" who is still living his Glory Days of the 70's, Ayoob's books are OK.
It depends on what you are trying to learn. If it's how to shoot better, there are far better books. If it's about the Law and when you can or can't defend yourself, you can learn just as much by reading the appropriate Criminal Codes (RCW 9A and appropriate sections) and the Firearms regulation Statute RCW 9.41 in its entirety.
One Good Book is "STREET SMARTS, FIREARMS, & PERSONAL SECURITY by Jim Grover".
Another is just about anything written by Jim Cirillo, including SECRETS OF A MASTER GUNFIGHTER - Jim Cirillo's Advanced Guide to Combat Shooting and Gunfight Survival.
Unfortunately, Nr. Cirillo survived numerous gunfights, some say more gunfights than Wyatt Earp, Bat Masterson and "Wild Bill" Hickok combined, yet succumbed to an auto accident Jul 13, 2007.