OK, I might be in the minority here but I no longer even use SEP tracking tools. The positioning, impression, and click data that Google's tools give me on keywords is more than enough and if frankly more relevant to me. And these days I'm more worried about impressions than anything. Rank is irrelevant in the face of impressions... and with Google split testing the SERP results just because you show at #12 in a 3rd party tool doesn't always mean you're getting all the traffic of a true #12. Google is constantly shuffling results through the day and based on geo location and even time of day. Which is why when they report positions the quote an "average position" instead. Most tools just take a snap shot of one SERP result for one location. Highly inaccurate.
And the value of a position is all relative. Would you rather push a #14 keyword that gets you 6,800 impressions a day to #13, or would you rather push a #5 keyword that gets you 3,200 impressions to #4? The impression share is more important, and Google themselves gives you that data free of charge.
-ThopHayt
