right now i have the sony car deck md unit, it also controls my 10 disc changer....yeah i could easily put in a plug in so i could run my hi-md, but really that's a lot of wires and stuff in my little truck, so to have a hi-md unit i could still play all my old md's and the hi-md's too. i'm sure it is coming out, but when????? guess no one knows, yet