Yeah, Ultimaphazon and I are, I think, almost through all of the chambers. We've both had our "'derp" moments, but usually one of us solves the puzzle, so I guess we make a good team!
I'm also really impressed by the co-op, I knew it was fun, but I didn't know it would be this fun. Portal 2 might be(come) one of my favourite games. Really like Glados as well and most of the levels, while challenging, aren't overly difficult.
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I'm but a simple companion in the pack of gurus whereof SuperNiceDog is the pack leader!