Again, I've only used the Thom books but I'd recommend them. Well laid out, for the most part clear and almost always accurate. Books 1 to 4 are very good.
The ones I wouldn't bother with are Book 5 (which you wont need unless you do an IMC) and Book 6 (which contains far more information than is required for the PPL Human Factors exam) - I've got a copy of book 6 but hardly touched it. If you do need a Human Factors book "Human Factors for Pilots" by Green et al. is supposedly better anyway. Finally, you could get by with just a copy of CAP413 rather than Thom book 7 (RT), but CAP413 is a bit terse and I've found Thom's RT book more helpful.
Last edited by Evo7; 17th April 2002 at 17:30.