inputs.text: good unit - alpine ina900bt car nearly two years installed firmware upgrade navigation update must say glitches early systehem freezes need reset not happened long time quite happy systehem would purchase screen bright sharp connect iphone use blue tooth need charging use cable ipod feature works great use pandora phone well sound quality good even without optional amp not really understand negative reviews experience product really good currently unit selling discount good buy thank alpine brianupdate 9913 added optional amp ktp445a 114 amazon money well spent sound good great oehem speakers 2008 mx5 highly recommend amp big boost sound quality crisp clean clear sound low high ranges amp ready made alpine quick install connectors fit hu