I must have a listen to some more audios. I did listen to one (not a Big Finish) with Tennant doing the narration as his Scottish self and the Doctor as the Doctor which was kind of bewildering as a result.

The first proper Ace one we watched, though, was revolutionary - getting to the end of the 25 minutes and not being aware that the time had passed, wanting to go straight on to the next one and suchlike. As much to do with Seven coming into his own as anything, though.