I took the demo and thought it was quite good. So much so that I am now taking the "Learning to Read Music for Bassists" course to brush up on my music reading that I haven't used in 20 years before I start my private lessons with a new instructor in a couple of more weeks. It's a very good course. I plan on taking more. In fact, I may take the "Walking Bass" course that starts next week.
Have Fun!