I really can't comment on P7 diffculties but i heard from other friends of mine it is more "knowledge based", very "theoretical" & stuff.
Their opinion is that it is only useful for those who wish to embark on audit sector for a long term period (otherwise its quite impractical).
Judging from students feedback most don't "like" audit since its quite "meticulous" & "tedious".
However, the main factor that not much people chooses P7 bcos lack "tuition providers" aka lecturers
The main lecturers for F8 audit did not even continue lecture for P7 (sheila john, phillip woo,....etc), they opt for P1 instead.
I heard there is a good one at FTMS (Fung chee kong) but don't know still got teaching or not ?

Although P6 have the lowest pass rate among all ACCA papers but with good practice & skills (plus a strong foundation in Tax knowledge) its
not that difficult. However there is also mass exodus of Tax lecturer (Chong kwai fatt, Chow chee yen,....etc). Plus if you believe it Tax is the
most boring subject (repititive & tons to memorise) may put off some people. However someone with good tax knowledge can surely impresses
any "layman" out there.
Try to tell ACCA to your relatives they will be dozed off, not interested.....etc
Now try to tell them you can cut their tax by few hundred if not thousand of ringgit they will surely impressed   
(they even belanja me makan after that  )

Chin Ann previously taught at KSA then FTMS then Kolej Bandar (quite recommended for audit & tax) His style of teaching was very refreshing & student friendly. The fees are not expensive either but facilities are inferior compared to other colleges.

Actually this is the first time i heard people call audit easy    . well its not unheard of since some students are good in memorising, some reasoning while others calculation experts. I heard from others that experience of work is vital to pass audit (procedures & stuff). You can give it
a go      but self study for Professional optional paper was a bit risky but achieveable nonetheless.

If you need a tuition provider for P7 there is only one reputable center which offers lecturer = FTMS (Fung Chee Kong). I heard he was quite good too. KSA, MCO did not offer this (maybe revision only).