I am 5'0"! I bought the GM-I wanted a tote and the PM seemed too small. It didn't take long for me to realize I made a mistake. The GM was too big. Not only was it overwhelming for my frame, internally it was far more spacious than I needed. I found I was using it as a purse and would maybe throw something else in, such as a drugstore purchase, a scarf, etc. Anything larger such as my iPad would weigh it down pull it out of shape and make it look clumsy. The little straps didn't seem sturdy enough to support a bag that was filled with heavy items, and I didn't want a tote I had to baby. I gave up, sold it with the idea of buying the PM, which I never did.
As a tote, I felt the GM was poorly designed. While the size suggests its' for larger and heavier items, it doesn't have the necessary structure and support for its intended use. In my opinion, the PM is adorable and far more versatile than the GM size.
sorry to hear that!
I might end up getting a PM at some stage but I love the GM size on me for now.