As unoffically the first to install M2W on a ZL1 I can say the product works exactly as described. It is a true 5 minute install. What I like the best is the homelink control and the fact that it stays in the mode you select until you change it. Mine is open unless I have someone with me on a longer trip.
The flow must be almost 100% to the straight through outside exits when open, because my inside tips stay clean. So you will be able to tell Z owners who have a controller or have pulled the fuse!