We purchase 2 of these chairs for my husband and myself. They're comfortable great for your back and cool due to the mesh. It's the best office chair we've had to date. It stays on the settings and gives us no problems. I would recommend this chair.
I haven't taken full advantage of the lumbar support yet because years of sitting in a bad chair got me into the habit of leaning forward too much but I do feel it there when I force myself to sit back. I'm hoping it will help when I have to sit at the computer for a long time.The adjustable armrests are the best part. I have a torn shoulder and keeping my arms level as I type takes a lot of the discomfort away. The variety of adjustments one can make is nice to have as well. It didn't cost much but it feels like a luxury.