Well, so far, I'm 3/5 on accuracy. 2 of my first 5 flights checking for wi-fi before I left, the widget was wrong. 3 times it was right.
I think that just about ceases my use for this widget. It was pretty useless before, since I always carry my laptop anyway, and can't/won't change my flight within 2 hours just to have wifi.
Now that I've seen it's not accurate, my initial interest is now gone.