I listen to these lectures when I clean house, so for three or four hours I feel like I'm in one if those lecture halls. I get a near-total Alan Watts experience.
The app, you will want to know, has no idea where you last left off, so you must listen completely or be willing to listen again. But, if you know Alan Watts, then you're already familiar with hearing it all before. Still, the app should be a tool not merely a playback device, which this one is.
Improvements this app needs:
Remember where you last listened w amount listened to viewable from TOC.
Ability to take notes, star, or pinpoint important moments so you can reflect on those ideas later.
Higher legibility. The display is low contrast and ugly.