I've downloaded two courses- the jazz etudes and the genius chords warm-ups. Mixed results so far. Both courses have some useful stuff- but boy are they time-consuming! I'd have liked some simpler starting points and a bit more consideration for those of us with limited practice time. It's a big ask to do drills in all keys, at speed, without a major investment in time. As a Brit, I also find the tutors a bit big-headed and showy. Perhaps it's a cultural thing, with us being more understated. But I don't like being told about how "amazing" etc stuff is all the time- I'll be the judge of that, thank you! I'll keep going with the exercises, but I have to say I've found other sources more useful. Especially those that run a bit slower and, for example, get me fluent in 4-5 keys rather than trying to cover every key going. You might disagree, but for many of us it is about being a functional and improving musician, not being "genius" or "boss level" or whatever.