Those look nice. I know that Baja Designs is also releasing a similar light bar in the next few weeks that is using a 10 watt LED. The only thing with the higher wattage LEDs is that you also need a larger reflector.
I have yet to see any night shots of an LED bar with a 10 watt bulb vs the 3 and 5 watt versions that are out there now. I would like to see how the output of running less LEDs, but at a higher wattage affects the output. Do you get more throw, or just more lighting?