im using MEX R1 and i don't have any problem watching DVD while driving. Installed the item myself. Don't connect the parking cord to your handbrake. If you do then you can only watch when stationary. Monitors frm Japan also have these function, like Addzest that im using now but somehow the shop managed to make it on and watchable while driving. Zone to Zone works like this, you can make your rear passengers watch DVD while you in front listen to radio or audio CD if you have cd changer. By the way, my dad's car using Sony low end HU, CDX 380 and the bass output is powerful for the speakers im using. Im using Carrozeria, and i have to put D bass to middle and bass setting very low, then can enjoy sound. HU not bad, but wish can have frequency settings like Pioneer HU.