I am not familiar with these devices.
However looking at their datasheet, and guesstimating from their Cd rating and their beam angle, I figure that these devices put out about 0.5 lumen at 25 mA...a far cry from 'twice as bright' if you can buy LEDs that put out 5 lumen at 75mA and similar voltages.
If you use Lumileds 'Superflux' devices, I figure that you get about 3x the lumen per watt performance.
A potential nice feature of the Omron devices is the light coming from the outer area of the device...I'd expect these devices to be more comfortable to look at since the light is coming from a larger surface area.
-Jon