Yeah. A lot of my books are in audio format, as I do a lot of running. I commented on Steven Pacey's narration when I left a review of one of the earlier books. He definitely enhances the experience of these books.Having read the First Law books I'm now currently listening to them on Audio. Steven Pacey does an absolutely brilliant job of bringing them to life. You can find them on YouTube if you don't have an audible account.
You should definitely finish the series and be careful to read the stand alones in the correct order. The final three (Age of Madness) are just on another level!