This was one of the things I was wary of actually... have you noticed this on your camera Wail?
Yes, it's an issue to live with; but if you don't like it then pass on this. For me, I'm always using the DR-5 so squinting and moving my eye around isn't much of a bother really.
Another issue, if you're using this on a D700, is the fact that the viewfinder is only 95% of the picture frame. Now, this has nothing to do with the eyepiece; however, it has a lot to do with composing your picture.
Because of the viewfinder limitation, I find that I need to guess an adjustment to the field of view; I have to make sure that I don't get any unwanted artefacts in the picture. Because of the eyepiece magnification, I have to keep moving my head / eye all the time to get the readings I want. Could the two together, and this can slow-down your shooting! At least, it does for me.
But, as a landscape, nature photographer, this isn't much of an issue. Mountains, sand dunes, and woodlands aren't going to be moving much while I keep composing
