I have been using my 1D Mark II N since getting it having graduated from my Canon 20D. I wanted the 8.5 fps and the full features of the 1D series and was amazed at the quality of pictures it produced, even at only 8mp. The 7D has many of the features of my 1D and then some...
Very easy to set up if you have worked with Canon D series cameras before
Shows flaws in all but the best glass