Sylvan Muldoon's techniques

My brother lives in Sylvan Muldoon's hometown and it brought me to ask the question here: has anyone used his books and his techniques with any success?  His books date from the late 20's to early 30's as i recall, one is at amazon, his most famous: http://www.amazon.com/Projection-Astral-Body-Sylvan-Muldoon/dp/1447402251/ and I remember him being considered one of the old classics.

Any experiences, ideas etc. would be appreciated.