I haven't actually had occasion to use this as an airline carry-on yet, but Ive used it on Amtrak and loved it!  It is very lightweight, which is a big plus when hefting it up and down train steps, but is sturdy and protects the contents well. The wheels glide easily, and it was very maneuverable both pulling it through the train station and down the aisle of the train car (the spinner wheels are a nice plus here). Since I haven't carried it on a plane yet, I cant speak to whether it meets to requirements for a carry-on (fitting under the seat), but the size looks right. Even though its compact, its designed with lots of packing space inside and deep, convenient pockets outside.  After just one trip, I can see that this will be my go-to suitcase for many occasions.