Why buy one when you can get a Surefire/Modlite/Arisaka with a tape switch for the same price? The listed lights give you more mounting options and locations. The Cloud Defense light, while I’m sure is a good, simpler solution for a top rail mounted light, seriously lacks versatility.
For example, my SF M600DF is mounted at the end of a 15” handguard with an attached tape switch. Because I have a tape switch, I am able to position the switch on the rail that is most ergonomic for me, which is a few inches behind the light. If I had the Cloud OWL, I would have to crane my arm and break a solid position to activate the light.
So for the same price, I would definitely look at a Surefire style light plus tape switch.