My new suitcase and I just took our maiden voyage together.  It was lightweight and very easy to manage in long lines (TSA) and in tight spaces (airport ladies rooms).  Not even once did it tip over when I let go of it.  The expansion zipper was better than I expected.  I didn't use the expansion zipper when I packed for my trip, but returning home I opened to zip the regular closing zipper and then I zipped the expansion zipper closed and everything still packed in nicely.  I was able to lift it over my head to put it in the overhead storage on flights without hurting myself or dropping it on the unsuspecting traveler underneath.  This is such a great bag I'm considering getting a second one for my husband.