I've been working with the Nokia Appliances and the IPSO OS, since they were first released. These boxes loaded with Check Point FW-1 provide top notch security. There are lots of CP books out there, and I was surprised that there wasn't a Nokia book also. I ordered this right when it came out, and the book has been a huge help to me. Its well written, comprehensive, and concise. The UNIX appendx at the end is very good, becaue you dont need to be a UNIX guru, but you do need to know the basics if you have to go beyond Voyager and get into the command line stuff.