The problem I have (and OP may have it as well) The chair might be comfortable for the first 3, 4, maybe 5 hours. But past that it's a problem. Plus what's comfortable for you ass isn't always comfortable for your back/neck.
At work we have Steelcase Leap V2 chairs and they're comfortable for 12 hour shifts plus they have been in 24/7 use for at least a decade now and only recently have been showing some issues.