Upon reading Blake's endorsement of the J.W. Speaker LEDs I bought a pair. They have a great low beam. Beautiful coverage.
Only real testimony I can offer is that when I hit a deer and it took the right lamp bucket right off. When I finally stopped the car the bucket finally caught up with me. I retrieved it and while the bucket was a mangled mess of scratches and bent metal the LED was beautiful. When the new bucket showed up I popped the old LED in and it fired up!
Try that with an incandescent!