I used Chad's vidoes, were AMAZING IMO! Hadn't looked at Gchem in 3yrs when I stared studying for the DAT, and I made a C in both Gchem classes in undergrad...made a 24 in Gchem on the DAT. But I also used the DAT destroyer for practice problems.
Chad's videos + DAT Destroyer = great combination.
I used Chad for the tail end of Orgo 1 and he helped me so much. There were some basic concepts my professor didn't explain well enough. I'm now using him for Orgo 2 and some DAT prep.