Precise free serivce for traffic "predicting" ? What do You think ?

Hi, I was working on this for past year with my small team of entousiasts:

http://www.webranker.info

This is free service that will tell You number of visitors that any site has. Now we are still in BETA 1 phase, but we are improving our alghoritm every day. Please visit, test it, and tell me what do You think. Of course , don't forget to leave some feedback, a lot of users do that, and that is most important for futher improvments of this service. Until now, acording to our users feedback WebRanker "predicted" correctly about 90% of sites that our users tested. WebRanker service precision is great for sites that has up to 1 000 000 monthly visits (I mean visits, NOT unique visits) and now we are improving part of alhoritm for biger sites. Please visit us, use it for free as much as You want, leave some feedback and tell what do You think. It will stay absolutley free, we want to make it to be as precise as it is posible to serve to everybody...