I've listened to a few pieces of audio in this Lit2Go and also had some mixed quality. This is a very good one: http://etc.usf.edu/lit2go/220/a-defence-of-free-thinking-in-...

This other one seems to be missing a pop filter during recording, there are a lot of awkward mouth sounds, and the audio is muffled: http://etc.usf.edu/lit2go/168/common-sense/2961/part-1/

Still, audio quality is better than LibriVox. Are the recordings also public domain in Lit2Go?