The puns alone are almost worth the purchase. This novel approach to music education is composing a whole new movement. It stanzas on its own two feet. This is an Ode to Joy of music theory. It is like the triads took over suzuki.
More seriously. This is best way to make music theory interesting and, dare I say it, fun. Of note, they are quick to respond to questions. There are a few supplemental cards that look like misprints. If you check the FAQ, it explains that certain countries that have alternative notation. I didn't RTFM but they kindly answered me anyway.
I give the Lord of Chords 5 Jimi's (E #9). A must for anyone that wants to progress past twinkle, twinkle or chopsticks.