That is one of best truly pocket throwers out there. I have 3 Quarks, including this one (kind of, I legoed it) and it's on the top of my favorite light list. It's truly great and good quality light. Other deals will be available after this one ends. Not the most budget light out there, especially cost per lumen. But UI is the best there is and it still puts out lot of light.
Just to give heads up, no connection to the seller (other than being big fan of their products) whatsoever.
Excellent light. Excellent price. I have the old XPG AA2 tactical so I'm passing this one. But I recommend it to everyone. Still waiting for that hi-CRI Quark or Preon to be reduced...