I shoot with the Nikon D700 and love the wide field on my EdgeHD 800. It's kind of cheating in that the field flattener is already build in, but it is sharp out to the edges of the chip. Vignetting is not that big of an issue and is easily controlled by processing with image flats. My biggest gripe with the D700 (aside from the diminished red sensitivity - no one yet mods these) is the weight. I'm getting a much lighter camera (will be modded!) to use on my Meade 5000 APO so the crayford focuser will not be constantly pulling out.
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