Hi, I just purchased a non-unibody MacBook Pro 15" in great shape. This is my first Mac. I love it. I have been using just the speck case to transport it in my messenger bag to and from work. The commute consists of just a car ride. I had not been using a sleeve with it. Just close it up with the Speck case on it. Put it in the bag and go. I carry a couple of small books the the power adapter with it in the bag. After reading the forums a bit it seems people are using the Speck case and a sleeve. Am I crazy to just use the Speck alone? Thanks for your thoughts.