This has become my main bag, it's even replaced my rolling carry on.  It was a little stiff at first... but I guess that can be expected out of any new bag, but has softened up and easier to manage.  I used it for a trip to Europe, and was easily able to fit everything.  It's easy to carry thanks to the backpack straps and side carry handle... makes it nicer to carry between the aisles when you're boarding/unboarding, and you don't have to pause to fold the handle on rolling luggage.  Stairs are also easier to tackle with a backpack too.  The only thing I wished it had was a shoulder strap, but using the backpack straps, I really haven't missed it.  The open design makes it as easy to pack as a regular suitcase as well.