You may not get this problem - I don't know. The discs are dual layer, not RSDL , which makes sense - rather than have a layer change disrupting an episode, they simply place two episodes on one layer, and two on the other layer. The audio is supplied in English or French, both in Dolby Digital 2.0. The soundtracks are marked as surround-encoded, but I only noticed sound in the surrounds on one or two occasions. I listened to the English soundtrack and the commentary.
Dialogue is uniformly clear and readily understood.
Even a few moments when the dialogue is whispered come across quite clearly. Audio sync was perfect. The background music in Buffy is good contemporary music. Nothing extraordinary, but it does the job. In my review of the first part of this season I remarked that the audio did not seem to be surround-encoded, despite being flagged as such.