Still having trouble with redirects... what am I missing?

<?xml version="1.0" encoding="utf-8"?>
<extension version="2.5" type="plugin" group="user" method="upgrade">
	<name>User - Amy's Custom Redirects'</name>
	<author>Geraint Brown - MindYourBizOnline</author>
	<creationDate>Sep 2013</creationDate>
	<copyright>(C) 2013 Geraint Brown - MindYourBizOnline. All rights reserved.</copyright>
	<license>GNU General Public License version 2 or later; see LICENSE.txt</license>
	<authorEmail>[email protected]</authorEmail>
	<authorUrl>www.mind-your-biz-online.com</authorUrl>
	<version>1.0</version>
	<description>Redirects the user to the page they were viewing upon logging-in</description>

	<files>
		<filename plugin="amycustomredirects">amycustomredirects.php</filename>
		<filename>index.html</filename><!-- ensure a blank index.html is placed in the root of the package too -->
	</files>
	<config>
		<fields name="params">
		</fields>
	</config>
</extension>

<?php
/**
 * @copyright	Copyright (C) 2013 Geraint Brown - MindYourBizOnline, Inc. All rights reserved.
 * @license		GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('JPATH_BASE') or die;

/**
 * An example custom profile plugin.
 *
 * @package		Joomla.Plugin
 * @subpackage	User.profile
 * @version		1.6
 */
class plgUserAmyCustomRedirects extends JPlugin
{
	/**
	 * Constructor
	 *
	 * @access      protected
	 * @param       object  $subject The object to observe
	 * @param       array   $config  An array that holds the plugin configuration
	 * @since       1.5
	 */
	public function __construct(& $subject, $config)
	{
		parent::__construct($subject, $config);
	}
	
   /**
     * ON LOGIN
     * 
     * Method to get the url of a user at the point of login
     * Then redirect them there after successful login
     * 
     * @param   object  $user       The user Object
     * @param   array   $options    The login options
     * @return  bool    true        Passed Login      
     */
   function onUserLogin($user, $options = array())
     {        
         // Check site - bail out if not the frontend
		 $app = JFactory::getApplication()
         if(!$app->isSite())
            return true;
		
		 /**************************
		  * ALEX'S CODE GOES HERE
		  **************************/
         
		 // Return 
         return true;

     }
}