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So guys, what do you think about it?
At best, it will help choose keywords where you rank 6000 instead of 150000
Personal opinion of course!
It is much more constructive to inspect the top 10 SE results.
There are a couple of much better indicators to measure how competitive a keyword is, for example:
Search google with allinurl:"Your keyphrase with quotes"
It gives you an idea of how many webmasters have tried to use this keyword in 'super optimized' pages
Search the KW in a SE and look at the top 10 results, then look if the pages listed are root url (eg www.mysite.com) or deeper pages (eg www.mysite.com/somepage)
There is also a good tool at seomoz.org that makes several similar calculations and gives you a composite index.
Remy
KEI - well, its not more than an indication of what you *might* expect for competition. But it's nowhere near indicitave of how optimized those pages are for the keyterms. If you have a well-established authority site, new keywords would be easy... vs. if you have a brand new site, even getting some with a crazy high KEI might take some work.