Other than you? Nobody has said so. And most of the commenters are established musicians who have no need for a beginner level program like this.

I mean, I wouldn't go back to driving school after this many years of driving.

A good many people here have played their song manually many times and charted the chords before even sitting at the computer. My songs are written before I ever even open the tools PG sells us. That is the "knowing music" part. This discussion has never been apples to apples. These new tools are for the person at a level of "So what is this thing you called music?" Clicking icons is not learning music. It's not even really creating. The creating comes before the computer interfacing starts.

The demo screen on their web page shows a selection box for I IV I IV, and V IV I I, etc. How does a green newbie know what those mean?

There's a quote from the owner of this that says he wants to "help people with little musical experience start by taking baby steps." Sitting at a computer clicking on a screen is not gaining "musical experience" any more than eating carrot cake teaches about gardening and baking.

Learn music. Scales, keys, sharps and flats... Then I Iv V will mean something to you.

Remember, the bottom line for these folks is to make money. They likely don't really give a damn about educating the people who give them money. Yet possibly ride that bandwagon that curses school system who eliminate the music department in budget cuts.

With no apologies I will remain old school when it comes to music. Learn the nuts and bolts of the craft. Play music for the art. If your art is good, money will follow. The software that is the focal point of that article is not really what PG software is. It's really like a toy piano vs a Steinway.