Very similiar in style to "Running Linux" by O'reilly (3rd edition) - In fact, these two books are complementary. I recommend buying both (I did). Many topics in one are not in the other. Together the make a very good and complete set.
They both share the same writing style - they cut right to the point, tell you exactly what you need to know and cover a lot of topics at a good level of expertise. If you know computers then these books are fine - you won't be wasting your time on general issues (like what a mouse does). If you want to configure SAMBA - Boom, done. If you want to set up lilo, boom, done. If you aren't a reasonable computer user, then you shouldn't be starting with linux.
If you know NT or a little linux, then these two books will cover almost everything just fine. The only thing they don't do is give specific references to each and every shell command or utility. You get a good overview of the important ones, and the man pages will be fine after that, but you could always buy a shell/programming reference.