I'm 5'6" and I have the medium dotcom - it's a great size.
Easy to use, a little heavy but I added a Strap You, which I think adds some weight.
Overall one of the most attractive bags I own!
Thanks so much for your response! Since I originally posted that message, I managed to visit a store that carries them (none of my local stores carry Fendi, sadly). I do like the medium size! It's a very attractive bag.