I too have been using this remote for quite some time now, at lease since last summer (2000). I had misplaced the original remote in the car for my Mk1 unit and went to Circuit City for a replacement (my only local Kenood dealer). Thew were out of the direct replacement but had the RC-600, the one we have been discussing. I asked if I could try it before I buy and viola! it worked! Then, after I received my Mk2 unit I began using the same remote for it. The only function I am missing is the INFO on/off toggle. I just have to hit a few extra keystrokes and it can be done just as easily, almost routine for me now. I would HIGHLY recommend upgrading your exsisting remotes to this one. I *HATE* using the old credit card style unit when I leave the RC-600 with my other unit. I need one for each of my EMPEG's!! Hope this helps anyone who is still unsure.