Wirelessly posted (7100t: BlackBerry7100/4.0.2 Profile/MIDP-2.0 Configuration/CLDC-1.1)

I haven't used the latest BB browsers bit comparing it to my 4.0 browser:

OM has a cache! Going back and forward is instantaneous. This is huge.

Screen navigation in OM 4 beta is pretty slick. Esp the zoom feature.

Bookmark and search navigation is a bit more advanced in OM.

OM has smart keyboard shortcuts.

BB browser must n be used for downloads and OTA software installation.

I think OM renders pages in a more useful and intuitive way.