Yea, i have it in a plane and it's alright... costs more,,,, you can get 30 pack of bucks for what one of those cost.
http://www.ebay.com/itm/DC-DC-Buck-Converter-Step-Down-Module-LM2596-Power-Output-1-23V-30V-2014-/301218533352?pt=LH_DefaultDomain_2&hash=item4622060fe8