For those who are reading this:-
The money spent on GMATToolKit has by far been the best investment I have made for my entire GMAT preparation. This has been my GMAT study companion for past 2 months. During this time, I believe, I have spent more time on this app than all other apps combined. I just can't imagine my GMAT preparation without this app. If there was a way to donate, I would gladly pay more for this app.
I have gazillion tips and tricks that I have developed using this app, and best practices to make the BEST out of this app. I have created awesome error-logs, based on my needs, using the app's build-in error-log, which I extract by exporting it to my email. Once my GMAT is done and I have more time, I will share all these tips and tricks, along with best practices, in details - I just don't have time right now. I still wanted to take this opportunity to recognize walker and bb for their tremendous work creating the app. I will share all my artifacts after my GMAT, i.e., in 3 weeks.
If you are preparing for GMAT and have an iDevice, I can't recommend anything more than this app

Good luck everybody! And thanks again to walker and bb.