A lot of it is wonderful, though as with everything, there are some mediocre installments in between the good ones. andraste once wrote several rec posts which seduced me into starting with the audios, but that was many years ago, and by now of course there are a lot of new ones. Until about three or four years ago, they didn't have the license for any New Who characters, but now they do, so you can get both audio plays with the Classic characters and with the more recent ones, and anything in between.