I just tracked down a cerise sac plat about two months ago and LOVE it. This sounds so funny, but I think this bag makes me look taller and thinner! But I think it's because the bag is long and thin itself! I'm able to fit my wallet, makeup bag, keys, cellphone, pen, mints/gum, and a few other things. Even though it's long and thin, my things don't get stacked up in there, so I can find everything easily. Whereas, I think things "roll around" in a speedy and depending on it's size, it's harder to find stuff in there for me.
I don't like the speedy because of it's slouchy/saggy bottom and can squish from the sides... But it's still a classic style! I'd definitely try putting your things into the cerise at the store and walking around with it A LOT. It's a different style, but I love that it's not everywhere and it's comfortable to carry. Plus the cherries make me so happy!