I'm not a big fan of the LED lights to the front of the vehicle for the simple fact that they're not as noticeable as strobes/halogens unless you are looking directly at them.
If you don't believe me, try this experiment sometime. Park a rig around the corner of a building where there's another building across the street. Turn on the lights and walk around the corner. Strobes/Halogens will be much more noticeable then LED's because they seem to project light much better.
To the rear of the rig, LED's are absolutely the way to go...just not to the front or for intersection warning lights.