I passed air law earlier this year. I found the Trevor Thom books OK until I read the AFE Jeremy Pratt books.
By comparison the Thom books seemed long winded and reminded me of junior school text books.
I much preferred AFE.
The confuser is good in the way that you see how the questions are worded in an exam.
However, read whichever book you choose cover to cover before you attempt the confuser. I did this and found my weak areas, then I went back and re-read those sections.
Hope this helps and let us know how you did.
Ben