Wonder what's their cooling system. The big drawback for YAL-1 was that the chemical laser required insane amount of energy to function well enough to take out missiles and the cooling was a major problem. It's not much use to shoot down a single drone, missile or a mortar shell if you then have to cool it down for 30 minutes.
Plus drones are ridiculously easy targets in the first place. No armor and plenty of soft, fragile components that can cause a mission-kill even without total destruction. Low-altitude ones can be brought down with AAA and high-altitude ones are so big that they are easy targets for radar-guided SAMs.
And no, we're not going to have Command & Conquer style orbital laser cannons any time soon.. Atmosphere is too much of an problem, even with the rapid-fire "let's burn a hole for the real beam to go through"-technique.