Hey, i'm using AO along with the 10-week EK study schedule (i modified it somewhat to fit my circumstances, given that i'm taking a heavy load this semester) and find it very helpful so far. I can listen to it between classes, right before I go to sleep, etc. However, the key is, at least for me, to listen to the lecture once all the way through...then next, to critically read and maybe take notes, then lastly to listen to as many times as possible to patch up whatever gray areas that i might have (i think this is suggested by EK as well).
BUT, i would argue that it's a "complete study package" as advertised....you kinda need to heavily supplement it with the EK materials in order to get the score you're lookin for. Though for me, it really cements the ideas/concepts presented in the books...hope that helped