Disadvantage: it seems that lots of questions are taken from previous exam papers which is not very helpful as I can get past exam papers from ACCA webpage and by buying Revision Kit I would like to get EXTRA question practise. P.S. Bare in mind that those past exam questions are amended to reflect current syllabus.
Advantage: everything is in one place including: Question index, Topic index (key F5 syllabus topics), Analysis of past papers, Plan for revision, Mock exams. And it doesn’t cost that much so I think it’s worth buying it.