Pretty good. Cushion is well padded and very comfy, the back is nice and supportive for my back. 

The arms and tilt are my main improvement points. 
I wish you could lock the centre tilt (I know you can lock the back tilt, but the chair tilts slightly forwards/backwards still when that is locked) and I wish you could lock the arms at a certain height as when I lean on them they just fall down to a level that isn't natural/comfortable.

Otherwise, it's a huge improvement over my last chair and so far is fairing well for long gaming and drawing sessions.