I get a straight 450Mb/s. That's better than a powerline adapter by more than double.
I WAS going to use a powerline adapter from my house to my barn, but as it turns out my E4200 reaches all the way from my house to the barn, which is a considerable distance. This is also tested with a plain internal laptop wireless adapter, not the trendnet. I haven't had time, but I will set up the trendnet adapter out there, I bet I'll get 3 bars.