I did Osler and thought it was fairly cost effective and worthwhile. Its what you make of it. I thought sitting through all the hub bub for 7 days straight and hearing it helped, I did this the October prior to my Boards in June. I like everyone else had the Osler and ASCP printed notes, but how many people really read all the way through it, I think the course is good b/c it makes you sit through it, reckon it depends on the type of person you are and one's motivations. One thing that was interesting was the people who would take Osler the week before their boards, that just would have probably scared me, just my opinion.
My pal and I took the Osler and we passed both AP/CP. I knew two other people that just did the notes on their own and passed both. I know several who did just the notes and flunked AP and CP. I do know of one that did the notes and passed CP but not AP. All of these people are now if fellowships.
One pearl is that I don't think any course will be the magic bullet. If a resident hasn't been keeping up with the material all the way through then Jehovah and his angels aren't gonna save you from that cesspool of despair that waits for you in Tampa.