It works for me, as long as I go through the trouble of installing it so that it works with newer versions of OS X. Their FAQs almost explain how to install it, but the final step is to change the permissions on the folder it is installed into so that everyone can read and write to it. If you do not do that, you may be able to use it from the administrator account that installed it, but no other user will be able to use it. This is a problem even with the version supplied by Canon for their printers.
I doubt that Omnipage has any more Mac developers left. It is a shame, as it could probably be much improved with just a little work.