I have actually found speeds better the last few weeks. I booked a trip on delta.com on both my Thursday night and Friday night flights this week. In fact I did so while I also had a window open to my slingbox watching world series games. Everyone else in row 4 on my PNS flight Friday night was watching over my shoulder.
So while I have often dumped on Gogo for lousy performance compared to what it was when they first launched it, it was very nice to see the last two games of the world series this week and it worked very well. Having said that, my Slingbox tends to work better on my iPhone using 3G then it does on Gogo, but I am not complaining about Gogo this week.