Summary: I had owned the Jura Z6 prior to getting the Z7. The Z7 is, in many ways, similar to the Z5/Z6—with just a few exceptions. The Z7 is much easier to keep clean and, by that, I mean that it may still have as many water, milk, coffee splashes on the front, but the matte aluminum front doesn't show it at much. The Z7's drip tray, I believe, is better designed and allows liquid to pass through better.
Pros: Easy To Clean, Easy To Use, Great Taste, Large Water Container, Quick Brewing