First, let me say that if you don't spend much time reclining in your office chair, then this is the WRONG chair for you. Plain, and simple.

Second, getting this chair without the headrest is a waste of time. If you don't get the headrest, get a different chair. You'll thank yourself.

This is by far the best chair I've found and this is almost entirely due to the recline-headrest mechanism. The most unique feature of this chair is the ability to recline and still have adequate support to see your monitor.

Out of a 10-hour workday, I will spend roughly 7-8 hours of it in a slightly-reclined to fully-reclined position. This position helps take a lot of pressure off of my back. The headrest is designed to stay "upright" while you lean back which makes it easy to read, view a monitor, type, etc.

The lower-back/lumbar support is aggressive when compared to other chairs, mainly because it's intended to be used while reclined. The back support also moves a little to encourage movement and shifting while sitting in the chair.

The arm rests recline with the back which helps keep the arms comfortable. They also can adjust in quite far and are longer than normal arm rests.

The seatpan can include standard foam or gel. I personally prefer the gel and can easily sit in this chair for 10-hours or longer.

That all said, in the upright position, the headrest may be in the wrong position for some folks and may push your head too far forward (or let it fall too far back). As I mentioned before, the headrest works best when slightly reclined. I had one of these chairs for 7 years and there was never a problem--even the fabric showed almost no wear. I sat in it 10 hours a day, 5 days a week.

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Amazon.com - HumanScale Freedom Chair with Headrest, Black ...