Pjtn,
I had the opportunity to buy a similar H3Dll-31 back last week in mint condition,low mileage
and very inexpensive.
Unfortunately,tests showed that hundreds of hot pixels started appearing around the 15-20 second
mark making the back an impractical choice for my needs.
We should have a better idea by this weekend how the D800/D800e performs as it seems they will be shipping shortly.
Mark