Although it is expensive, there are two big reasons I purchased it.
#1- The driver is amazingly flexible. Having the ability to set and switch between (3) preset user interfaces makes it like having three flashlights and its not hard to find three 150.00 flashlights. Plus the flexibility of the UI options is off the page - you can have almost any UI you want on any one of those presets.
#2- The quality is very very high. I have blown throw aluminum flashlights very quickly at work. Four7's, zebralight, lumintop, etc.have all had short life spans. But titanium and a sapphire lens have been relatively indestructible to this point. It has endured lots and lots of drops on concrete, rocks and metal, welding spatter, the occasional hammer-like tapping and so on, and it still works perfect. It just has light scratches on the titanium.
To me, it's like buying snap-on tools. They have an edge over most other hand tools. That edge comes at a high cost and honestly most don't need that edge and therefore can't justify the cost. But that edge makes the difference in daily hard use and at the end of the day it can make the difference of finishing the job or not. This light is in that category. It has an edge over most other lights but it is an edge that has proven to be worth the cost for me.