Another Herman Miller user here, we all have them at work. In fact I have one at home too as one broke in the office and the company could not be bothered to sort out the warranty side of things.
I also have a standing desk, this has been a revelation for me, more so than the chair. We use http://uk.varidesk.com/varidesk-pro-plus-48
I also have a standing desk, this has been a revelation for me, more so than the chair. We use http://uk.varidesk.com/varidesk-pro-plus-48