Hi WhiteRaven, I obviously did the written course - before the CDs came in. However, I did buy the Bardic CD version when it came out to see what it was like.
Personally, I still like the freedom the paper version gives you. I liked being able to take the gwers with me to read on journeys or down the bottom of the garden. I tend to find I'm less likely to pick up my CD player to take with me so sadly I've not done much with the new course. I have tried to listen whilst walking the dog, but sometimes found myself reciting aloud something much to the amusement of passers by! I also won't listen to the CDs whilst driving as it can be distracting.
Of course if someone is used to listening to CDs/MP3s etc. all the time then perhaps the CD version would suit them better than it does me.
Having said that, however, the joy of actually listening to someone telling you things, especially the tales, is awesome. The music that accompanies the gwersi is beautiful and really puts you in the right frame of mind.
Difficult choice to make

Both are excellent sources of inspiration and knowledge.