Same for me - I went from a 305 to a 683. Felt small to start with but now feels just right. The black ceramic bezel sets it off really nicely and of course no concerns over scuffs and scrapes which the titanium bezel seems to attract. The hands and markers are white too which give a lot more contrast against the dial than the green of its larger brothers. I'm now wearing it on an Erika black / aqua strap which really sets it off.
Could be persuaded to move mine on as I feel the need for a Carbotech.....