Make the switch! Rated 5 out of 5 stars

Seeing as so many Vimperator users will be reading these reviews, let me say: don't think about it; make the switch. The thing that really made me change was the broken search suggestions. However, once I switched to Pentadactyl, I realised how much is incomplete in Vimperator (e.g. addons window and downloads!). Moving over completely is easy:
Type :mkv to save your Vimperator settings
Copy the .vimperator/ folder and .vimperatorrc files as .pentadactyl/ and .pentadactylrc
Install Pentadactyl
Disable/uninstall Vimperator
Restart Firefox

This review is for a previous version of the add-on (1.0b7.2.1-signed).