Viper stools are the shizzle. I've been looking at one but just have a hard time with the price point on them. But as they saying goes, You Get What You Pay For.
At that price, I'll keep "up-cycling" and modifying old office chairs for the price of $free.fidy
I have one. Love it. I went back and ordered the tool tray after the fact. Crazy price but I dont have to explain my expenditures to anyone.