We purchased the Delsey Hilium Aero 29" Spinner Trolley first and then followed that purchase with this Carry-On Model.  This luggage has all the right specifications and features to give you years of travel use.  The hardshell is Polycarbonate so it is attractive but more importantly very durable and yet light weight.  Each Luggage piece is Expandable so if you end up bringing home more than you left with you are all set.  The TSA approved contemporary zipper lock is much better than having to mess with various purchased after market locks.  The wheels glide effortlessly and the spinner design gives you a lot more options as to how to pull or push it along vs. the older two-wheel designs.  The inside of this luggage is well appointed with various zippered covers and a pockets.  The lift handles are quite comfortable and spring back flat against the hardshell case when you aren't using them.  I have travelled with a Tumi 20" Carry-on for years, and this Carry-On is lighter, but actually holds more even when not expanded.  We looked at way too many luggage choices and are very happy that we chose the Delsey Hilium Aero models.