d800 = just works...
When shooting the moon I always went on the f16 1/25th rule. That being I start the exposure the same as a sunny day (iso100,f16,1/125th)
I use a Leap at work - like it... no issues and fits me well.
My workmate uses an Aeron, and it seems to work well for him, but he a bigger man than I.
If I had a choice right now - I would still take the Leap,
I use to have an Eames knock off many years ago - really liked it as a listening chair. Would like to get a real one someday, just need more income.
I use a Ikea poang right now... works well.