I'm just looking for some opinions but I was wondering if anyone has taken the QuickTest Pro upgrade exam from 6.x to 8.0?

I'm pretty comfortable with 6.5 and would like to get certified in 8.0. For those that know both: any estimates on how long it would take to learn the new features of 8.0? I've done research on Mercury's web site and I don't think it should take too long. The keyword view and step generator look neat but the tool seems to work very similarly.