I have done the AIO + Insulator routine.
I worked on a 14 year old Honda Accord with 200,000+ miles that had never been detailed.
I used Meguiars Medium Cut, DACP worked in really well, AIO and Collinite.
The AIO served as a great cleaner and left the surface in good shape for the wax.
I did the car in June, I believe, and washed it 2 weeks ago and the Insulator wax is holding up well.