I been trough the COD twice, two different versions, latest was 4.5. It made a big difference when I started to lab over the volume II labs again even when the labs had good solution guide. I take my time and dont rush through the labs, so one lab can take up to two days. I do the labs and then verify with SG for every time I do a task. Just to get the understanding, I can work with speed later. I did take the first 6 volume III labs, but I use 5 hours on them so I know I have to work with speed. Its not a concern yet. ... read more »