This plugin's functions do not work on Bukkit 1.8.7. The /vs command does however, show all the info and messages when you do a command, but no matter your setting, you die in the void normally as if the plugin is not even installed.

I am aware of this and taking a look into this today.

After doing some testing everything things seems to work. If you are using permissions that give you all permission make sure to negate vs.override. An example of doing this for pex would be:

/pex group add -vs.override

Other than that it seems to work fine.