Update March 7, 2022
Now the chair will not go down. It goes up ever time I get up. But when I sit down, it lowers back down again. 

Update February 28, 2022
The seat has bent and is now crooked, you slide out of it if you try to sit in the chain. Today I sat down after lunch and the seat lowered itself while I was typing. Do not buy this. 

Original Review Bought to start working from home due to COVID, very comfortable and the height variation is great for multiple desks around my house.