I have one and have tried it with paraliminals. To be honest, I have not noticed as much of a difference using it. The sounds are crisper because of the boosted higher frequency response (similiar to using or not using tweeters in your hi-fi system), but as far as increased learning, I am not sure.
This is such an individual, subjective, personal area, that it is hard to say that it does or does not make a difference for me or that it would for you. I do hope that after reading my reply, you will still go out and get one, and at least try it out during the trial period to test it out and satisfy your interest and curiosity. With your also trying it out, we will, by sharing our experiences, have collective knowledge about it. It will also give me added motivation to use mine some more, and learn how to use it more effectively.
Wish you the best.