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So how many people here actually use Wordtracker? Has it been worth the investment, and can you name one thing that really makes it stand out from just using Overture?
In my opinion, it's not good at identifying infrequently-searched terms. Because the sample size is so small, the data has to be multiplied up to compensate, and errors tend to be multiplied too.
Overture, on the high end, is skewed at the high and because of automated searches... and because it lumps singulars and plurals together, and groups searches of different word orders together.
On frequently searched terms, WT can be useful in distinguishing among singulars and plurals and indicating relative search order.
I look at a range of tools, including Overture, Trellian, and the Google Adwords external tool (which, alas, has gotten less and less useful for determining order of search frequency). Occasionally, I'll also look at WT.
When you start seeing results in one tool that are way out of line with regard to the others, then it's likely that an automated search has messed up that data.
I've paid for it in the past for short-term projects and since it is so cheap I don't really have any complaints about the standard of information it supplies.
But if you really want to know more definite details about your keyword market get a budget together and buy a limited term ppc campaign.
As mentioned, Overture's results tend to be highly skewed due to automated searches. Combine that with the lumping of singular and plurals and the incorrect ordering of many phrases and it loses it's usefulness.
WT has a fairly small db as Robert mentioned, but it can give you some fairly good data until you get to very small niche phrases at which time it loses it's usefulness.
Keyword Discovery has a much larger db, but it is generated over time so, while it is larger and can be used to look for the smaller niche phrases, it loses it's usefulness when you are looking for seasonal trends.
Summary - None of the options are perfect. They all have their strong points and weak points, which is why I generally use all of them to get a good overall picture of whatever market I'm going after at the time.
There seems to be a lag (~10 days) in their data and like all keyword tools some of the info is a bit suspect. However, it does offer a few items most don't and I have been spending more and more time with it. I used to rely on Google and Overture keyword tools exclusively and have used most of the others, GoodKeywords, Keyword Discovery, etc.
But for uncovering niches, bids, competition, eCPC, etc. it's my "go to" tool right now.