I recently purchased and completed three PDHengineer courses. I was able to find courses that interested me and that I found to be of reasonably good quality and of appropriate level of difficulty for the PDH credits earned. The course materials were easy to access and download. The website functioned well for the most part. The one thing that I did find a little annoying is that after completing and submitting the quiz for each course there was an invitation to write a review while you were waiting for the result. If you did not respond, but wanted to submit a course review at a later time, there does not seem to be a way to do that.