For those who have never seen it, a My System sample can be seen at:
https://www.qualitychess.co.uk/ebooks/MySystem-excerpt.pdf
A Chess Praxis sample can be seen at:
https://www.qualitychess.co.uk/ebooks/ChessPraxis-excerpt.pdf
Various samples:
https://www.newinchess.com/media/wysiwyg/product_pdf/9027.pdf
My System in my crappy opinion is overrated. The companion volume Chess Praxis, is better, My System presents theory, and is a bit difficult follow (honestly I think just long winded), Chess Praxis is annotated games showing the theories in practice.
Thank you for the rec. I will take a look at Chess Praxis.