If you're after a proper Ergonomic office chair and don't want to drop +$500 then this is a good deal. RRP for these are $450-550.
These are only on the floor at certain officeworks stores to try, but they are in-stock to order online to be picked up at your local.
If you don't want a high back the medium back with arms is also available but the price difference is only $50.
No adjustable arms, no lumbar support, not full mesh. May be right for someone else but not my cup of tea