Went through 237 OCU in early 70's and spent 7 years flying the Bucc. The OCU was unique in that most of the pilot conversion was done by navigators. Great bunch of blokes doing a very difficult job teaching from the back seat of an aircraft they had no control over.
Would prefer to hear the opinions of those that successfully completed the course rather than a bunch of has beens who never got over being chopped from the best job they never had.