[paul_manias]

It's right at the front near your knee. The level of discomfort would vary between people, but I find it to be very noticeable once the padding's worn out.

[eyeball]

that's why I got rid of mine. front of the seat behind the knee. too much feeling the hard rim that holds the mesh. despite numerous tries to adjust the chair properly, it still bugged me. got rid of it for a steelcase leap. much more comfy.

[weird-eye-issue]

I second the Steelcase Leap. I have used both the Aeron and the Leap a lot. The Leap is a significantly better chair

[rsj_hn]

I am very happy with my steelcase leap. It has the right balance of cushion and support as well as lumbar support, and it is quiet, long lasting.

But a chair, like a bed, is a very personal thing. We all have different bodies and different support requirements.