This plugin has been tested with PermissionsEx, PermissionsBukkit, and bPermissions. Though it should work with any permissions system supported by Vault, I cannot as of yet vouch for its stability using any permission system other than listed here.
If upgrading from version of SlotGroups previous to 0.2.5, please note that the configuration format has changed slightly. It will generate a config.yml when run the first time and won't touch your old SlotGroups.yml so you can reference it if needed.