I bought the Dior saddle in plain black leather with silver hardware from the Dior shop in Vegas last year. I had wanted one for a couple of years and it was a " frivolous" holiday purchase - I expected to only use it occasionally but i actually use it all the time. It is true that it tucks very comfortably under the arm so is easy to carry.
You have to edit the contents ruthlessly - there is really only room for purse, phone and keys though it does have quite a practical hidden pocket on the back that you can slip stuff like (thin) mobile phones into. It also has a zip pocket inside.
I agree it is a classic design - I never knew about the strap breaking so easily so thanks for the warning, I will be handling with care from now on! Which part of the strap did it break from giagiaja?
lastly I prefer the plain saddles - I dont like all the fancy embroidering and colours - just a personal opinion! A month after I bought my black saddle I saw one in plauin fawn leather with gold hardware and given the choice now I think i would have gone for that one.