I started to use the system a few months back and it is exactly the thing that I feel like I had been looking for, for years. It allows me to read very actively and retain the knowledge for a long time and even write my own pieces based on what I have read in different books and so on. Also it not only allows me to reflect on what I read in a real and productive way but it also acts like my own personal wiki. But setting it up and figuring out how to incorporate it into ones life takes some time and thought but for me it's time very well spent.

As a side note it is important to not use the system as just a dump of ideas and loose notes. Those are good as a starting point but I would recommend that you go through your loose notes and ideas twice every week. This is so that you can either make them permanent notes or just throw them away.

One last thing is that I have found that the combination of this + anki makes it really easy for me to commit stuff to memory and really speeds up my learning process by a huge margin. I wish I had discovered this way of reading and learning when I was in uni xD