If you like early SMT (SMT1, 2 and ...if) this is a treat. If you like his work on Devil Summoner as well like the original and Soul Hackers. Lots of both his demon designs and his character designs. There's also lots of Maken X work in there too which is one of my favourites because of just how wacky/insane it is. It's basically all of his work up until Maken X (SMT1, SMT2, ...if, Devil Summoner, Soul Hackers, Persona, Persona 2: Innocent Sin, Persona 2: Eternal Punishment, Maken X), so it's missing his PS2 era stuff. If you understand any Japanese there's lots of interviews as well. I think it's a great art book at a great price (if you get it imported from Japan), get it.