I am posting this review after 18 months of using this carry on.  I LOVE IT.  The bag has worked well every time I used it.  Going upstairs?  Just pick it up with the shoulder strap,  Last week I used it in downtown Boston.  It rolled well over most of the surfaces.  The only surfaces that gave it a little trouble were brick and cobblestone sidewalks.  The zipper still works well to convert it from the storage state of the usable state.  And the fabric still looks like new.  It is just the right size for a one or two night stay.  I couldn't be happier with my purchase.