I have used AWR over the past three years for only organic tracking. We have run into trouble with Yahoo as well some time ago, but fortunately became unblocked. The latency is critically important as it mimics a user browser search. I have found a 5-12 second latency to be effective for small searches and a larger number and spread for bigger lists. Obviously, while marketshare dictates Google/Yahoo/MSN, I have found that adding more engines ( 8 ) adds another layer of latency. Lastly, the deeper you go in rankings, the more risk you take. As most people do not go past page 3, the risk/reward becomes increasing after page 5 in my opinion. Lastly, there have been occasional glitches with the software. It is advised to shut down and restart the program every so often for "engine updates". The maintenance plan is critical for big updates, although I was taken back when suddenly after an expired maintenance plan could not suddenly pick up Google rankings. Algorithm change or Marketing Ploy? Hmmm. Nevertheless, AWR's email support is top notch.

Good Luck!

-Wildman