Been thinking about getting one of these, as i have a roof mounted screen for the kids to watch, at the moment i have a seperate dvd system and head unit so i can listen to my music while the kids watch a movie with head phones in but im a little sceptical on the quality of these units http://www.halfords.com/webapp/wcs/...3_categoryId_165743_langId_-1?cm_vc=IOV4PDPZ1 any one had any experiance with these before