I've noticed that for me I get different levels of impact from different tapes. Personal Magnetism is by far my favourite.
I haven't listen to any in a while, and I've even lent a few out. However, I believe they all have the common idea that after the paraliminal you stay curious and notice how the tape is manifesting in your life. Sometimes it's subtle and builds. However, if you start with the idea "It didn't work for me", and I'm not saying you did, then you are not likely to notice any effect.
I believe the staying alert for the effects is a big part of the feeling the benefits.
Just my thoughts.
Good luck, and sending love,
Iam2 
