Master is a work of art.  It might be, out of all the hundreds of Big Finish audios I have listened to so far, the single most emotionally moving story I've encountered yet.

I really like all the characters here.  Not only does the Master and the Doctor have a number of incredible scenes and lines here, but the supporting cast is all very memorable.  I got invested in Victor and Jacqueline, and they worked really well as friends of the Master's assumed identity.

The audio is at its best when it is nothing but quiet build-up, mystery, and a growing sense of dread and darkness.  I love the framing device of the Doctor relaying this story to a sniper.  It's very good an a cool take on the Master and Doctor's past together.  Death showing up was quite the twist, and I kept waiting for it to be revealed she is some secret alien in disguise or something, but no.  It's Death, personified and with a very specific agenda here.  It's good stuff all around and absolutely gets a recommendation from me.