I listened to some tapes by Dr. Gerstner on Luther, Calvin, Edwards, Reformed Evangelism and several Q&A's that were delivered at Believer's Chapel in Dallas, TX. These messages were given in 1987 so I don't know if Believer's Chapel still has them in their inventory, but after hearing them, I want to read and listen to more Gerstner.
So, Preach, I guess your warning is right on!