I agree, the only experience of Sandhurst I have is from watching presentations. Put it this way, a good proportion who make it through IOT would never make it through Sandhurst, but then the aims and the products are a completely different kettle of fish.
Its probably a very personal viewpoint about any type of Officer training. I was well equipped fitness wise, and in the military life. I felt it did change me though in confidence, bearing and being able to lead more effectively. For that I am very grateful.
No idea how you quote - it has never worked for me!