Using my existing Nikon lenses would entail using stop-down metering and manual focus, not a problem for me or the photography I would use this camera for. On the upside, the body/adapter combo weighs in at a good 0.3 kilo less than a D7000 and comes in at half the price...0.3 kilo being another drink or meal that can be carried for the same pack weight ;-)
And, due to that the small size body and the increased clearance as a side effect of the adapter, you might even squeeze on a PC-E lens (however crazy that might look!) and get a good range of tilt/shift movements. Interesting!