Actually, they aren't all Four Forces notes, however, EPTA themselves admit that their notes in many subjects are poor.
Certainly there is no comparison with Cabairs and OATS notes. OATS notes are in another league.
...but then OATS charge as though they are in another league!
To get around the problem, the instructors often use their own notes from previous schools (eg PPSC).
The best thing about EPTA right now, is that because they are only in module 2 of their 1st course, they have very small classes, and I think that can be extremely beneficial.
They also offer free re-training on any subjects you fail.
For these 2 reasons I think it is good value for money.
IH