I ran over that bridge in driving rain about 2 weeks ago. I was only on a 10km run and i hated it.
When I ran over it twice it was 30 degrees+ and (what seemed like) most of Stockholm were shouting at me. Also, someone handed me a huge Gherkin at 21Km.
I would like to run the Stockholm Marathon next year - you just pay and run.
Anyone else interested? It's a nice course, even though you will hate the bridge on the second circuit.