While I'm waiting for my other body to get back from Nikon I decided to pick up a D7100 for a backup. So far I like how it handles. Here are a couple of shots I took with my 105mm with 32mm of extension tubes. I'm sure the results could be much better if the guy holding the camera knew what he was doing.
BM7_0084 by BMalinis, on Flickr
BM7_0092 by BMalinis, on Flickr
BM7_0084 by BMalinis, on Flickr
BM7_0092 by BMalinis, on Flickr