My honest personal experience when it comes to Project Orion and Java Masterclass in general is the course is good. You get a lot of information that is helpful when learning, and is much better than trying to search through sites like Stack Overflow or watching YouTube videos (some of which are very outdated). There is a general positive attitude throughout the course which makes the experience pleasant.
Something I do wish was better was that the videos were a bit shorter, along with more bite sized type videos (where you have a video for one topic, instead of a video that is covering multiple topics in the same video). Overall I would say that I have had a great experience with the course so far.