Thank you all for your quick responses, I really appreciate it! I just found his explanation of Anicca a bit odd, but otherwise think the discourses are very insightful. Perhaps his approach in this case is simply too advanced for me or I have misunderstood something. In any case, I will continue to listen to his discourses in order to get a better overall impression.
@Jorg, I am looking forward to the sermons and will listen to them in full when I get the chance.