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.
8300 Curve: viigo, gmail, google maps, way too many emails/day