I bought it only once. In fact the label made me think that it was carbonated water for some reason. I bought it and drank it and realized I was scammed. Since then I judge people who buy this crap.
I still buy the carbonated (black can) from time to time. I didn't buy it sooner because I was under the assumption that "Liquid Death" would also be caffeinated, and I couldn't imagine an unflavored caffeinated beverage tasting good.
(I tend to drink more Waterloo or Spindrift when not at a bar, personally, but I've enjoyed the flavored Liquid Death that I've had.)
Agreed flat water out of a can is… not my favorite.