I definitely agree with this although I think you could lighten the shading and get away with the current method. The dark grey just creates too much of a contrast change for me to read it easily. It only adds a split second to my reading time, but it is noticeable.

I also don't really like the boxes/buttons at the top (they look very much like every other site trying to create a mickey mouse design), but this is probably just my natural resistance to change. I probably won't even notice in a week.

I changed to DDG a while back as my default search engine and must say that I've been extremely happy with it. To hear about an interface upgrade was initially a little upsetting as it brings to mind the recent changes to Google. The preview and instant search features are what finally pushed me to the simplicity of DDG. I'm glad you kept the same clean design and didn't try to change what already works wonderfully. Please keep up the great work.