Wordtracker

A few questions about Wordtracker. I’ve been using Overture’s keyword suggestion tool up until recently. Another discussion I started pointed out a key reason that Wordtracker might be more useful to plotting your Google strategy than Overture’s tool. (Thanks Aspen)

So, I’m wondering how other’s use Wordtracker. Does anyone have a membership? I’ve just been using the trial, is the paid version worth it? Are there enough enhancements to justify the cost?

Also, what do you make of the Keyword Effectiveness Index? see http://www.wordtracker.com/help/keihelp.html Some of what I’ve seen with the KEI is around the opposite of what I’d expect. So, either some of my unconscious assumptions were wrong, or the KEI isn’t always right. I’m wondering how much importance I should put on what the KEI is telling me.

Any other tips and suggestions about making good use of the information Wordtracker provides is appreciated!