Ha, I don't wanna say "told ya so" but.... LOL!!!
Seriously though, yeah!!!! I know, I use it all the time to stay sharp and improve. You're gonna get the same holy-crap moment after doing the rhythm exercise in GNU Solfege and subsequently the site singing exercises. It comes quicker than you think if you're diligent about it and once you get to where you're picking up the book, singing the melodies and hearing the changes in your head before even picking up your instrument.... Well, it's very empowering and informative, you then have access to an entirely new language and all the information out there written in that language that you didn't have before. And it of course all just makes you that much more hire-able.... I do gigs frequently (in fact just last week, a last minute call @ 6pm on a Fri. night for a 9pm gig) where the artist had all original tunes I'd never heard, was musically illiterate in terms of being able to speak the language enough to call changes, and had no charts. So basically I showed up, set-up, she started playing and I just had to jump in the fire. It was a total test of every bit of academia I've ever picked up on to get through it - long story short, she called me the next day to book me through the rest of the year.
Since then, I picked up all 3 of her albums and have 2 of them charted so far... 
-PE
Seriously though, yeah!!!! I know, I use it all the time to stay sharp and improve. You're gonna get the same holy-crap moment after doing the rhythm exercise in GNU Solfege and subsequently the site singing exercises. It comes quicker than you think if you're diligent about it and once you get to where you're picking up the book, singing the melodies and hearing the changes in your head before even picking up your instrument.... Well, it's very empowering and informative, you then have access to an entirely new language and all the information out there written in that language that you didn't have before. And it of course all just makes you that much more hire-able.... I do gigs frequently (in fact just last week, a last minute call @ 6pm on a Fri. night for a 9pm gig) where the artist had all original tunes I'd never heard, was musically illiterate in terms of being able to speak the language enough to call changes, and had no charts. So basically I showed up, set-up, she started playing and I just had to jump in the fire. It was a total test of every bit of academia I've ever picked up on to get through it - long story short, she called me the next day to book me through the rest of the year.
-PE




