The seat and the back of the chair have the ergonomic curved shape that makes sitting in it very comfortable. It's also heavily padded, though not to the extent that it's too soft to provide good support.
To avoid back pain after a prolonged day, you can adjust the tilt of the chair to provide better support. You can also configure how far the back of the chair is rocking as you push down on it with your weight.
This is a great chair for work or gaming because it feels comfortable even after hours of uninterrupted sitting. It has some firm padding on the seat, a breathable mesh back and a headrest for alleviating the strain off your neck.
It's annoying that you can't adjust the height of the armrests, which may put some strain on your shoulders. To solve this, you could just remove them.
To ensure you're comfortable in your chair, you can adjust the height of the armrests. Once fixed, they don't feel flimsy or shaky but very firm, providing good support to your arms.
IKEA had the brilliant idea to make the wheels easy to roll while you sit in the chair but to have them lock out when you arise from the chair. This means that when you first get out of the chair, there's a chance you'll kick the chair over with your legs. This also means that if you get up from your chair because you want to move your chair to a different room, it will be needlessly difficult.
The tilt angle of the chair is fully customizable. Unlike most others, you can even configure the back of this chair to tilt forwards for maximum comfort. It offers good support for your back in any position.