I upgraded from a 450D and what a difference! I know I'm not a professional but I just get the feeling any bad shots will be my fault alone - I cannot blame the camera any more. It feels great and using it is exciting.
My first outing was a late dusk to night shoot in Hyde Park. The 7D handled the low light, with extraneous light from the City, brilliantly with plenty of colour extracted from the scenes. Every photo was a keeper.
Can't wait to get involved in sports, BIF, macros. For once I feel I have a camera that can handle any situation.
I was going to upgrade to the 5D MkII next February but the specs and some of the images I saw on the 'net convinced me. Now that I have it I'm thrilled and as excited about photography as I was when I first started.