As I've already said, the first Storm I looked at was running an earlier version of the firmware - it didn't even have the web browser installed!
Luckily the store also had a later release version with the browser.
Pages scrolled around much better than the Storm menus, although you have to remember to let the page load to completely first :)
I'm use to double tapping to zoom in, instead on the Storm you 'click' on an area of the screen to enlarge it.
It didn't feel as fast as the iPhone browser - could because I use my iPhone on wifi ALOT, could also be down to the fact that the two devices display and render pages differently.