One of the best parts of Tony's Acoustic Challenge is also what makes it pretty unique. It doesn't get boring and you get better. Each weekday, you learn a different skill using a song or song style. These 5 skills are the same every week and I'm already a more skillful guitar player than I ever was during 2 years of lessons as a kid to 1 year of online lessons a few years ago.
I'm not great at any of the skills, but I get better each week. This practice ranges from straight-forward to really challenging (Barre chords anyone?), but Tony is there to remind you showing up is what matters, doing the work. In the past, I'd work hard on a particular skill and then I'd burn out. Now, I practice 10-15 minutes a day and it never gets boring, but I get better. (I've been a student for 2 months)