I don't like them due to lack of support, but I work in a 24/7 control center where we all have our own chairs. A few people have these and the only one that's all broken down is about 10 years old. It is common for us to have 20 hr days and 80+ hr weeks.

This is what I'm sitting in. https://www.ironhorseseating.com/IH-4100.ADCGDA.3BL1