LL,
I used the king stuff to do the PPL and CPL. To give you an idea of the depth they go into, it took a total of 4 days to study for both. The comparison between the FAA CPL and the ATPL's is huge, IMO they aren’t really worth buying. A borrowed set might be worth a view.
I have found the oxford Met. CD Rom very useful though.
Hope it helps.
Regards
LF