I'm currently working with a Steelcase Leap, which I bought refurbished for a fraction of the cost of a new model from eBay. Since then I've realised this wasn't the smartest investment for me to make. The chair is great in terms of build quality, but the refurbishments (including a replacement of the foam with a super low-quality alternative), have made it quite uncomfortable over time. I learned one crucial lesson though - you either buy a chair new, or you better view the model before you take it off someone's hands.