On a selected keyword Google adwords calculate aprox. 300 000 searches with broad match and near 200 000 searches on exact match. When i type this keyword in wordtracker or in similar keyword suggestion tools is shown 0 or few monthly searches. So where is the problem, in google tool or in other ones ?
The google tool is ment as an indicator to how many impressions sites with ads that would be triggered by the keyword gets impressions, i believe.
I've tried a few other tools..most are pricey, and cumbersome to use. I have found Googles KW tool to be most reliable, easy to use, and FREE. Works for me!
Google KW tool is lacking in many of the features some of the paid programs have. I havent used one in awhile though and cant remember the names.
I believe that no one should waste their cash by throwing it in a keyword tool, the google tool is the best as it offers you the latest possible search results. You might find that these tools themselves extract the search results from google. So why pay for the very same thing that google has made available to you absolutely free.