phantom 3s range extenders

Hi guys just wondered if anyone is using any range extenders and whats your thoughts on them ? I just want a bit more range ,so have ordered one of these below , are they worth it ? Thanks Garry https://www.amazon.co.uk/gp/product/B01KQ9M25K/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1