I like the entire time / portal on SP. It's similar to how Portal 1 was. I really like the "community wave" where they show where you land in both time/portals. Hey, I want to be at least in the top 1/2.
I think we could have a friendly competetion here on QT3. I'm tmanpdx on steam if anyone wants to compare scores ;-)
So far, Anti-Bunny is the only one of my friends who have laid the beat-down on SP...Pyrhic and I laid the beat-down on the coop times. They are pretty challenging to try & figure out how to do something fast.