Works great on my Formula racer chair purchased in 2016 (almost 7 years ago). Also purchased on a Friday morning, delivered on Monday.

I just finished putting it together; it probably took me half an hour or so. I like the firmness and support of the chair itself (which I'm sitting in as I type this), a significant improvement over my old office chair.

Here is my experience. The chair itself is very comfortable. A+ customer service is what gives me a lot of confidence that I made the right decision in choosing this chair. 100% recommended based on the chair's quality and customer support!Overall, the chair is very ergonomic, supportive in the right places, and highly customizable.