Not much point until you've worked through them the first time actually doing the activites suggested. The L&S device works nicely with the paraliminals included in the PLCs. I am wary of listening to a speaker at a deeper level of mind on other tapes. Some of them inadvertantly have negative phrases that can adversely become a hypnotic suggestion that has a negative impact on you. So be sure to check the nature of the talk before you let yourself take it in by bypassing your conscious censor.
Alex