Is the text just abridged (and it must be one heck of an abridgement, because the original is huge) or has the text also been "tinkered with" (= dumbed down and simplified)?
I've not yet started the unabridged edition, 1180 pages. Just looking it over I dont notice that much change other than some modernization of the language. The abridged edition is 1024 pages. I ordered this new one from monergism.com.
The one mentioned above by another poster called The Embattled Christian is actually by Bryan Zacharias and is his introduction to Gurnall's work and his theme.