The 'Convert to boolean' plug-in does not work out-of-the-box in Drupal 7.
Here is a small patch to make it work.

Index: .../feeds/feeds_tamper/plugins/convert_boolean.inc
===================================================================
--- ... /feeds/feeds_tamper/plugins/convert_boolean.inc	
+++ ... /feeds/feeds_tamper/plugins/convert_boolean.inc	
@@ -79,11 +79,11 @@
     $match_field = drupal_strtolower($match_field);
   }
   if ($match_field == $settings['true_value']) {
-    $field = TRUE;
+    $field = 1;
     return;
   }
   if ($match_field == $settings['false_value']) {
-    $field = FALSE;
+    $field = 0;
     return;
   }
   if ($settings['no_match'] == 'pass') {

This has been fixed in version 7.x-1.x-dev.

will be usefull

How do i reference the "Copy source value" in another plugin on the same field? i want to copy the RSS description field into two targets. 1 target for field_body and 1 target for field_image. I want to copy source value to field_image and then using Feeds Tamper PHP run a REGEX to extract a jpg image from field_body to use in field_image.
thanks
lee

At times, you may want the output of a field to be dependent on another field. That is, if the controlling field is 'false', the current field output should be blank.

The 'dependency' plugin will allow you to select the controlling field.

Here is the code for dependency.inc :

<?php

/**
 * @file
 * Dependency of field value on another field that returns a boolean value. 
 * If the dependent field is false or null, then blank output of current field.
 */

$plugin = array(
  'form'     => 'feeds_tamper_dependency_form',
  'callback' => 'feeds_tamper_dependency_callback',
  'name'     => 'Dependency',
  'multi'    => 'skip',
  'category' => 'Text',
);

function feeds_tamper_dependency_form($importer, $element_key, $settings) {
  $form = array();
  $replace = array();

  foreach (feeds_tamper_get_unique_source_list($importer) as $source) {
    $replace[] = '[' . $source . ']';
  }

  $form['text'] = array(
    '#type' => 'textfield',
    '#title' => t('Enter controlling field (Select only one from the list of Available Dependant Fields)'),
    '#description' => t('Choose controlling field. If that field is false the output of the current field will be empty. Copy and paste one of the fields below into this text box.'),
    '#size' => 40,
    '#default_value' => isset($settings['text']) ? $settings['text'] : '',
  );
  $form['help'] = array(
    '#type' => 'fieldset',
    '#title' => t('Available Dependant Fields'),
    '#description'  => t('Choose one of these fields as the controlling field. If "false", the base field will produce a null output. Copy and paste one of the fields below into the text box above.'),
    '#collapsed' => FALSE,
    '#collapsible' => FALSE,
    '#value' => theme('item_list', array('items' => $replace)),
  );
  return $form;
}

function feeds_tamper_dependency_callback($result, $item_key, $element_key, &$field, $settings, $source) {

  $item = $result->items[$item_key];
  foreach ($item as $key => $value) {
    if ('[' . $key . ']' == $settings['text']) {    
      $field_dependency = $value;
      break;
    }
  }
  
  $field = ($field_dependency == 'false' || !$field_dependency) ? "" : $field;
}

To install this code, encapsulate this code in 'dependency.inc' and place it in the feeds_tamper/plugins/ directory.

For newbs.

Add plugin: Execute php code
PHP Code: return stripslashes($field);

Below Mentioned is just a single field . Any experts please suggest , how do I only filter out the BRAND - "ASDA Furniture " from this.

s:947:"O:8:"stdClass":14:{s:7:"Binding";s:14:"Kitchen & Home";s:5:"Brand";s:16:"ASDA Furniture";s:3:"EAN";s:13:"5055721699496";s:7:"EANList";O:8:"stdClass":1:{s:14:"EANListElement";s:13:"5055721699496";}s:7:"Feature";a:5:{i:0;s:68:"APPROX 10 INCH COIL SPRING MEMORY FOAM MATTRESS + 14 INCH DIVAN BASE";i:1;s:57:"12.5 GAUGE SPRING WITH 4CM VISCO MEMORY FOAM LAYER ON TOP";i:2;s:31:"MEETS ALL UK SAFETY REGULATIONS";i:3;s:24:"UK FIRE RETARDANT BS7177";i:4;s:57:"MANUFACTURED BY JOSEPH INTERNATIONAL FOR BED EXPRESS ONLY";}s:5:"Label";s:16:"Joseph Furniture";s:12:"Manufacturer";s:16:"Joseph Furniture";s:5:"Model";s:16:"DLOLMEMBCBRDDB50";s:12:"ProductGroup";s:7:"Kitchen";s:15:"ProductTypeName";s:24:"HOME_FURNITURE_AND_DECOR";s:9:"Publisher";s:16:"Joseph Furniture";s:4:"Size";s:22:"UK King (150 x 200 cm)";s:6:"Studio";s:16:"Joseph Furniture";s:5:"Title";s:88:"DIVAN BED WITH 10 INCH MEMORY FOAM QUILTED MATTRESS - ALL SIZES AVAILABLE (5'0 kingsize)";}";