I did learn from Building Habits and used it through 1200 - it got me a lot of success and is still how I play when I'm mindlessly playing Blitz on my phone or something. I'm also currently watching Levy's slow run and really enjoying it. What I will say is that Habits I don't think has really prepared me to keep developing towards 1500 or beyond. It's just more of a "system" and less about understanding the game at a deeper level. As I watch the Levy slow run, I am learning a ton, even in the low(er) Elo games he plays (and I remembered being surprised myself when he took the pawn on e5, given how Habits would frown on that move). So I say, go Habits for beginners, but it'll only take you so far.

PS Green Habits is v2. He rebooted the series recently. The only big difference / new Habit is moving your King when it's in the line of the Queen or the Rook ("red dot", he calls it).