I've been using the white ceramic for a year now. Almost daily. I scratched the crystal and noticed what I think is a screen defect. In the top left and area where the screen ends, and in the left area as well. I was going to sell it, but the ebay buyer never answered my emails. So I went to apple and they will either replace the crystal under warranty or charge me $79 to replace it. So I went ahead and decided paying the 79 was fine that way it's clean. The people at the apple store told me they thought the imperfections were scratches maybe from hitting dry wall and I disagreed so I decided to send it in to apple directly. The stuff in the lower right hand are not scratches.
Also these scratches aren't that visible in daily use, I have to look at it from an angle and with a light. Despite the scratches, for a wach with no bezel protecting the crystal I think it has done very well.
I don't see any scratches on the case, maybe it's because it's white. I'm very pleased with how it's held up.
A word of caution regarding apple care and the ceramic edition. Out of warranty service for the ceramic edition is $800. Apple care for the watch is 99 and the fee for accidental damage is 79. Apple care covers 2 incidents of accidental damage. I think apple care for the ceramic is totally worth it. Additionally, the ceramic edition comes with 2 years of warranty versus one for the regular steel and aluminum models so apple care adds a 3rd year.
I made a video that better illustrates the scratches but here's a screen grab and I say pretty much the same thing in the video. Search fer557 ceramic edition on youtube for the video. You can tell on the left hand the part that looks like a defect. I have no idea what it is, I thought maybe it was glue separating the apple store said no. We shall see, I'm sending it in this week to get fixed.