For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.
One of my church groups went through the Truth Project. Overall I thought it was very good, and we'll substantiated with scripture in most of it's points. There were a couple areas that were not directly Bible based but still had reasonable inferences (such as his sections on government/society.)
I thought it was above average for a group study, and there was plenty of material to revisit and discuss with the scripture references given.