1D is quite enjoyable and yet a challenge to use, as you need to know what you want. Having been using it for a while, I find I could get certain shots which I would not have been able to get due to its more precise and quick AF. Get the CANON E1 HANDSTRAP, you'll need it. Overall its more balanced when using with heavier lens, as compared w 350D, you should not miss the built in flash as one should use that only as a last resort.