All in all, the look is good but there are some minor tweeks the new slashdot could use:
1. Not enough contrast in the links in stories for them to be easily visible. That makes a big difference to old guys with deteriotating eyesight (like me).
2. No way for a story submitter to attach a link or email address to his username when he/she submits a story.
3. The story box is too small when making a story submission and makes it difficult to submit stories from an ipad.
4. When I look at popular in the firehose, I don't see the colors indicating their popularity anymore. This was really useful.
5. Please bring back the story rejected/accepted page that used to show up when you submitted a story.
6. The good - that you have retained the ability from the classic view to look at stories nested, flat, back to front etc.