I deiceded last April as I was in Paris to get the 2.55 bag and was hesitant regarding the size . Choosing the right size was the difficult part for me.Congratulations! 225 is the perfect size IMHO.
At the end I got the medium (which is the 255) which looked better on me.
I still had doubts after I just purchased it , but as I started to use it I realized that is the perfect size for me (it’practical ,fits all my essentials , light weight, looks perfect on me and can easily transition from day to night). I even used it in the airport (crossbody) for my important stuff and had a tote bag with for the other stuff and I insert the 2.55 in tote during security check.
I love the 2.55 as it is really elegant ( I really love the aged calf skin) . It looks luxurious but still understated which is very important to me.