Best money I ever spent on Wayfair! When we started working from home due to Covid, the office chair I had was not meant for sitting in long hours. Instead of spending 3 times the amount for a good chair, I decided this was the cheaper and healthier option.
It takes no effort to move up and down, it’s the perfect size and weight to fit on a desk and be stable without being overwhelming. 
I took a star off because there are two different models shown in the photos on the listing and the assembly instructions state the keyboard adjusts but the model I got does not.