I see there's been some discussion of this issue in the past. Posters expressed a good deal of skepticism on if the numbers it produces are accurate. Some recommended checking the box for it to search for exact keyword phrases.
Nobody can really attest to the validity of the Adwords Keyword Tool. However, there is a software called Market Samurai that it is totally awesome. I would look into it on youtube.
No G Adword Tool is not correct but provides a starting point. Use Adwords Tool with Market Samurai to dominate in Keyword Research.
I think Google adwords Tool shows reduced number of searches etc, tools based on google tools like semrush, usually show the same, or even the less number of them.
Google Keyword Tool results display an average over time and does some rounding. It is accurate, to a degree, because they would run into some legal problems from their clients if they were grossly misreporting traffic numbers. One thing that you should make sure you do when searching for traffic numbers is to select Exact match or Phrase match for the keyword phrase you look up. By default it is set to Broad match and that is a very poor way to estimate the traffic numbers.
I don't know google adword keyword tool is best or not or its giving correct information or not, but it quiet useful & sufficient for me..!
Google adword tool sometimes throws up unwanted keyword suggestions. for instance keywords that do not make sense semantically. otherwise it is a very good tool.
Doesn't know that google adword keyword tool result is correct or not but i trust it and always use for know keywords search volume.