Can someone that already succesfully used Selenium CORE give me a brief explanation about Selenium. I already went to the site and read the material.

I would like to read some testimonials about teh tool, we are reviewing open source tools and this seems to be a good one.

Ou application is 100% webbased and we want to start automating the easy test cases then move to medium and leave the more difficult for last.

What is the learning curve? How long does it take averga to become proficient?

Experiences.. good or bad are appreciated...