Mine has been on for 45K with just the sticky backing and speed tested to 170 on the autobahn
Got mine from here.http://www.ebay.co.uk/itm/New-Volkswagen-VW-Golf-Mk5-Edition-30-Badge-/250731911744?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item3a60c95a40