Not suitable for my site

I installed this plugin to enable me to have specific pages on the site editable by specific users, but have now deactivated it for the following reasons.

– User group cannot be assigned to existing users
– When user with write access for a group accesses a page assigned to the group, no edit option presented
– When only one group exists, new user is assigned to that group and cannot be de-assigned when another group is added
– Not tested on version 4.3.1
– Author’s website link fails