Yeah, I'm practicing the second alternate picking etude at the moment. I definitely regard it to be conducive towards my playing (intermediate level lead, not that I'm a lead guitarist in a band, but that I mostly play lead stuff) and it goes to show that this website is oriented towards all levels of playing. This is one of the first times that I've actually enjoyed listening to myself practice, as the second etude has a sort of Neo-Classical melody, while I progress in speed every five or so minutes. It's definitely helping with my precision. Good stuff.