I purchased the Copperhill product after plenty of people recommending it. Took almost a month to arrive from the US... I've put through almost 7000 frames on the D800 and this was its first clean.
Here's my result. I swiped three times - twice across the entire sensor and once down the sides. I'm generally happy, I couldn't seem to remove the crap on the bottom right side of the picture, however for now I'll just leave it since I think it could be oil rather than dust and I'll deal with it next clean down the track.