I tried to pruchase this product for transcribing minutes. It could work if you had the same teacher doing the lecture if you had multiple classes, i would suggest purchasing the more expensive product.
There are some variables -quality of your recording and if you have already trained your Dragon to your voic it might not be as accurate as wyou wish. To get an accurate rendition Draqgon has to be trained to the lectures voice but what the heck give it a whirl. Like the idea please let us know if it worked. and/or what problems you encountered.