I use one of these as a focus light. It's pretty good overall, the red light is nice during night dives for skittish critters. My only complaint is that if you turn it off, when it's turned back on it doesn't remember the last mode/brightness it was set to. For example I use it on low power in the flood mode as a focus light. If I turn it off, when I turn it back on, it resets to 100% power in spot mode, requiring a long press to switch to flood mode, then 2 more presses to get to 25% power.
I also use it as a focus light during blackwater dives, along with an Inon LF800-N 5 Degree I hold in my left hand for spotting things. I think this is ideal so I don't need to constantly change the Kraken from spot to flood and swing my entire camera rig around when looking for subjects.