What is the best chair you encountered for long computer sessions?

[MoonShadows]

I use a Tempur-Pedic TP9000 Ergonomic Mesh Mid-Back Executive Chair; Black

 

[CarpCharacin]

I have an Ikea Millberget chair

 

[Arty]

I used to have big office chair. Very comfortable, until middle of summer when it gets warm and those chairs have no ventilation for back.

Then I bought something like this:

Excellent chair. Very comfortable for 16 hours long coding sessions that I had lately.

 

[Alpha1]

I had the humanscale chair above but I couldn't get used to it.