Hi, I am in the same boat as you - I am thinking I will get my first LV bag soon, and I want to get a damier speedy. I was trying to decide between 25 and 30. I have other big bags, so I didn't think I necessarily needed the 30, but when I compared them in the store, the 25 was a lot smaller than I thought it would be, and the 30 didn't seem nearly as huge as I thought it would be. The size difference between the 25 and 30 seemed a lot greater than I thought also. It seemed like the 30 would be easier to get things in and out of. Obviously, they're both great styles, but it seemed to me like I would use the 30 more.