Ever since I switched to it back around a year ago, I was happy with the better security.
Behavior-wise though...
With v1.7, I'd go to a web site, page down a few screens, click on a link, read something, then hit the BACK button, and return to the position I was previously at.
Since then, with the upgraded versions, I'll do the same thing, BUT, 4 out of 5 times on the average, when I hit the BACK button, it returns me to the top of the page I was on previously, not where I was at when I clicked on a link. Especially on IWETHEY, where I'm reading older posts first in a forum, this is a constant headache that shouldn't exist.