After trying a number of chairs I settled on the first-gen Leap. It was far more comfortable for me than the Aeron or others I tested.

I'm still using it today, almost 18 years later. It's held up incredibly well. The fabric shows only the faintest signs of wear. A few years ago, the gas height-adjusting strut failed, and the Steelcase tech drove an hour to my house and replaced it. He also replaced the armrest caps as well - all for free.