If you can handle conversations then you won't have a problem. Missing the occasional word is okay because you'll probably listen to the Paraliminal more than once anyway. Could be a a way to build the language skill too?

Like climbing up stairs to the next floor of a building. You reach a level you are comfortable with and stay on that floor for a while. Later you notice there is room for more growth. Here some might say that the Paraliminals have lost there effectiveness, however, you have just reached the edges of your comfort zone and are ready for more. They do create long term benefits and lasting benefits when you use the skill.
Alex