I purchased the DIT lectures for IM because I feel like I get more out of formal sessions than from independent readings. If you prefer lectures to reading, its a good choice.
The DIT IM lectures are far from comprehensive. It does provide good high yield material in nice 30 minute lectures. I felt after an exhausting day I would rather watch 1 or 2 lectures rather than read.
So in summary, it is a good supplemental source and provides the highest yield material. It is a good way to get some of those formal didactics we all crave.