Impressed? I know I was when I first saw it! OK, on to some of the other stuff, like the buttons. The buttons on the 4000 are almost hidden. You can see some visual influences from current Frogs, but they are not the same.
See what I mean? Nice and all, but nothing like: "Dude, you need to see the buttons on this watch!". The 1000 is more like that I'm happy to say.
That center button on the 1000 also known as a Crown is the new OS for the watch. It is a huge upgrade over the 4000 that cannot be understated. For me, it's use is easily overstated though as I don't use many features on my analogs and do not think to. Maybe as I "grow" in my usage of the watch, it will become more valuable to me. I readily admit the 4000 is awkward, but the fact is that if it is your only watch you will master it and it will be "normal" for you not slowing you down at all. Again, since I just look at the watch and the time I do not run into it's limitations too often.
The buttons on the other side of both watches are boring, let me blast through the photos here:
and the 1000:
The casebacks. Well, let me just show you. If you do not know, then you are in for a treat. First the 4000, pretty much what you would expect from a Casio non-screwback.
Now for the 1000
WOW! That has to be the nicest 4 screw caseback I've seen!

On this piece, the picture is the 1,000 words and I do not have to add. I love cool casebacks. Count this one twice!
For whatever reason, people just don't want to believe the bands are the same and interchangeable. I'm tired of this fight. I'll just show the photos. First the 4000:
Then the 1000:
"oh, they're totally different, the 1000 is grey". Yeah, well that's just the RAF, the others are black other than the new FC-2. Mind you, that new combi bracelet on the "FC" 1000's is cool! And they happen to fit the 4000's since the bands are interchangeable.
OK, thoughts and observations shared. I know quite a few of you have both, so I am looking for further comments/conversation. There is no question from me that the 1000 is the cooler version of the watch, I just feel the value of the 4000 is heavily under-rated.