There is now a mobile app (both iPhone & iPad), so it's really easy to dip in and out of in your spare moments, and the format (10-20 minutes per lesson) really lends itself well to that.
It's not technical at all. He's very rarely in front of Cubase: it's much more of his philosophy of the whole business of working as a composer, rather than technical 'how-to' stuff. He talks about themes, stories, working with different functional roles (director, musician, producer, audience).
I watch and enjoy it on 2 very different levels: I'm not a professional musician, I'm a hobbyist, so sometimes, it gets a bit too specific (I'm never going to work with a director!). So, sometimes, I'm learning something interesting from a music perspective (his classic line of 'I like writing in D' - when he explains this, it makes a lot of sense). But at other times, I'm listening & learning from a totally different perspective. People often talk about how working in teams (I work in neuroscience research), and in particular, leading teams, is like conducting an orchestra. This analogy is beautifully expounded by HZ: with my neuroscience research hat on, I learned more about management and team interaction, than any of the useless management seminars I'm frequently sent on. I have often considered making this course mandatory for some of my colleagues, but I'm not sure if you're not also a musician, if the analogy would be too distant for them to be useful, I don't know.
I mention this only to say that: don't come at this for a technical breakdown of how to compose/orchestrate etc. It's not that. It's Hans' perspective on how to get by in the music industry, and there's lots to enjoy from that, even for an outside observer like me, and lot's to take away that you can make directly relevant to your own, non-music world. With regard to taking notes: there are course notes, for every lesson - I haven't really dived into these too much, and they're certainly not required to enjoy the lessons fully, but the 1 or 2 that I did look at, gave good consise summaries of what Hans said in the lesson, so no need to take notes.
There are other masterclasses, where I'm hoping it will be more of a technical 'how-to': I bought the 1year pass, so the classes by Armin van Burren and Deadmau5, whilst I'm not interested in the types of music they play, I'm hoping will be more of a technical insight, so if that's more your interest, they may be a better place to start (I don't know though, as I'm just starting going through them). Then there's the masterclass by Herbie Hancock, which I expect to be more along the lines of Hans' lessons.