15-years ago, or so, after reading Picker's ideas about exposing for the highlights, I gave it a try. It didn't work for me - I didn't have sufficient exposure in the shadows. I think the previous post explaining that Mortenson had a SBR of 4 is the key to his success with the technique - here in Florida with SBRs of 7-9 I needed more exposure and less development.
I agree that his ideas are useful to have in the toolbox.
juan