I just read an article which mentioned AdQuants as a useful tool. upon looking at it and what it does, it seems that it would be, but my only problem is that the information does not seem to be accurate. That however is when it even gives you the information. Many keywords that have a great number of impressions and clicks still come back, "Sorry, but there is no data to display. We'll try and get it next time!" The ads do show up in the search engines, and do infact have data, so whats up? Two of the keywords that I actually got info back from are as follows regarding the accuracy of their report.
I compared the adquants data to our own and they are more or less in line at the aggregate level. What i like is that they allow you to download the data. I was able to identify my top adwords competitors in the tool and then download all their keywords to see if I am missing anything in my own campaign--that's pretty useful