I've used these- really brilliant. Takes the pacing effect but makes it conversational so it really seems to flow. The trade-off, of course, is that it has no

I've used these- really brilliant. Takes the pacing effect but makes it conversational so it really seems to flow. The trade-off, of course, is that it has no idea how well _you_ have memorized various things (i.e., being prerecorded audio, it is generalized).