Thanks for the fast and detailed response.
To sum it up, the app is a timer + it tells me right away the answer as soon as I submit the answer. I'm glad it covers OG11 (or at least in the upcoming update) as that's what I have. It also includes all the questionnaires with answers from the forums, right?
A few additional questions. Do you guys have plans on updating it also for future OG releases (13, etc.)? And also I noticed that it also includes 2-3 other Kaplan books--do you recommend for us getting those books also?
Currently I have (I got them in 2008 but lack the motivation to proceed then

):
* Princeton Review - Cracking the GMAT 2008 Ed.
* Kaplan - GMAT Premier Program 2008 Ed.
* Kaplan OG 11th ed.
Thanks in advance.