Thanks for posting this. I actually have two segments on DL on 10/31. The first one is about 3 hours and the second is 5 hours. No idea yet if GoGo is offered on either plane but I believe it will be.
I have never tried the service but I've read several posts from people on here who were flying when they posted.
The only thing I don't understand is why DL puts GoGo on planes that don't have in-seat power. I have a decently new laptop but if I run the wireless card on it my battery will last about 2.5 hours. Hopefully in-seat power is coming to all planes soon
-RM