Better to just use the book instead.
The material is OK, but it's much less detailed information than the (much cheaper) book, with the only real addition being the handful of interview videos with the 3 couples they got video of. The content is slow and poorly edited — speaking rate changes by about 2x between videos, and the videos feel 'dumbed down' compared to the book. The 'cute' animations are more cringey than cute. The interactive writing exercises are just pulled straight from the book, but again are a simplified version of what the book has.
I recommend just using the book directly instead of using this site. You won't be missing much.
October 17, 2021
Unprompted review