Nitecore is a legit manufacturer. And some of their Tiny Monster series of lights are certainly desirable.
I would definitely enjoy having one of these. 6,000 lumens for 45 mins is nothing to sneeze at. However, this light was impressive 2 years ago when few lights could pump out this much light. So $300-$400 was not unreasonable.
But now one can get 10,000 - 14,000 lumens from an Emisar D18, Astrolux MF01S, or Fireflies ROT66 for $100 or less these days. So even $260 is hard to justify. One should know why they are purchasing this light. If it’s just to impress friends at a party, you can do better for much less.
But, if you need a light for serious Search and Rescue, night camping, a steady 2,000 lumens for hours, and $260 doesn’t break your budget, this light could definitely be a contender.