I'm curious if anyone has passed the CISM exam only using the following book by Peter Gregory? Amazon reviews are higher on it than the ISACA 15th Edition.
Seems like most people study these two for sure (15th Edition ISACA Official book) and the subscription for the questions.
https://www.isaca.org/bookstore/Pages/Product-Detail.aspx?Product_code=CM15EDhttps://www.isaca.org/bookstore/Pages/Product-Detail.aspx?Product_code=XMXCM15-12M
However, has anyone used Peter Gregory's book combined with the online question subscription *and* sucessfully passed the CISM exam?
Here's Gregory's book (which gets much higher ratings on Amazon than the 15 Edition does (granted that's tried and true according to this site): 
https://www.amazon.com/Certified-Information-Security-Manager-Guide-ebook/dp/B079Z1J87M
Hence - Why I'm a bit skeptical purchasing the Gregory book but it does have good reviews and a 2018 publishing date.....
Thanks!