Cross checking the visitor/summary stats the unique visitors don't add up.
We provide the StatCounter service to give you the best stats possible, the summary stats are based on a cookie to determine unique visitors. So it is very good for spotting trends over time.
The visitor stats - shows you in precise detail everything about the visitors to your website, so you can determine yourself exactly who has been to your website.
Answers to the majority of questions we receive can be found here in the knowledge base.