I've been flying a couple of PowerFlarm-equipped towplanes in Western Canada for the past two years and I'm unimpressed.
A lot of the time it doesn't work - a nearby glider will disappear from the display as the azimuth changes (which I assume is due to antenna issues) and when it does work, there is a tendency to fixate on the display.
My SOP now is to ignore the display, look out of the window for traffic, but be prepared to react if I hear a warning over my headset.