Personally, after spending 2 days reading this thread, I feel a strong consensus from most people posting, that OW training does not actually prepare a diver to be independent and safe while diving outside the supervision of an instructor or DM. I actually experienced this, first a little background, then my story.
I completed my OW in June, although I learned about diving and the basic skills to stay alive, I felt as if I was not prepared to dive on my own (by that I mean to plan and execute a dive with a buddy just as green as I). This notion was reinforced after completing the class.
Our class was structured with a study at home component, then 4 hours of class time on Friday night. After completion of the classwork and exams, my buddy and I had our pool dives on Saturday morning, 2 open water dives Saturday afternoon, then our final 2 dives on Sunday. I was excited to finish, but just after the completion of the Sunday dives, I realized that my buddy and I had no real clue how to plan or execute a dive outside of using our air tables.
Due to my lack of confidence, my brother and I decided to take the AOW class in the days following the OW class. One of the guys in our OW class was on the dive boat the day we were doing our AOW dives, it was a wreck dive that we were practicing compass nav, both the guy from our class and his sister (also newly certified OW) took the same dive but ended up not being able to get back to the mooring line, got caught in the current and swept 300+ yards past the boat. Neither one of them were able to safely perform the dive.
After the AOW course I finally felt as if I had the basic information and core skills needed to BEGIN to safely organize, plan, execute and return from a dive without the assistance of a DM or Instructor. Diving has become a passion for me, and I will spend a lifetime mastering these skills and learning new ones, but the true danger with the OW course is that in my experience, there is no warning or awareness that the OW course is a stepping stone, not landing zone.
~NJEDRN
"If someone accused you of doing a good job, would you have enough proof?"