The problem with a “free” translation, on the other hand, especially for study purposes, is that the translator updates the original author too much…On the one hand, these renditions often have especially fresh and vivid ways of expressing some old truths and have thus each served to stimulate contemporary Christians to take a fresh look at their Bibles. On the other hand, such a “translation” often comes very close to being a commentary, but without other options made available to the reader. Therefore, as stimulating as these can sometimes be, they are never intended to be a person’s only Bible; and the reader needs constantly to check particularly eye-catching moments against a true translation or a commentary to make sure that not too much freedom has been taken.
~ Gordon D. Fee