Unlike many other 'carry-on's' this one actually fits in most airline overhead bins. It's not as large as the others but you're not going to get hassled about the bag being oversize.

This bag has two wheels but unlike many four wheel spinner bags with wheels that extend father out than the two wheel counterparts, this one makes better use of the available space for your belongings.

My only gripe with his bag is the cheap plastic wheels and the design choice of putting the telescoping handle behind a zippered flap. I wish the wheels were roller blade style but instead Tumi used cheaper plastic wheels that vibrate (wobble?) more. I notice the vibration through the telescoping handle but my wife doesn't seem to notice it so perhaps it's just me.

I've used the bag in the following airplanes and have been able to put the bag in wheels first: A320, A330, 737, 757, 777, and 747. Only commuter planes seem to have bins small enough that I either need to put the bag in sideways or check the bag at the door. The biggest problem might be with weight restrictions that some airlines are starting to impose that are unrealistic.