The PMP PrepCast was used during my commutes each morning and evening for about 3 months. The test date was selected so I could see deadline coming ever closed. On test day I felt prepared, having also committed the basic formulas to memory. The exam was passed with a comfortable margin on the first try. The next 3 years was spent working construction management projects, typically 60 hour weeks. As a result, the PDU's didn't get done to keep my certification so now I must repeat that exercise. Lesson: once you attain your PMP goal, plan to retain it by keeping on track with a PDU goal.