I would be careful about getting too excited with four spinning wheels on luggage.  They are fine if you are only going to travel within the US, however; if you are planning on using the luggage in Europe, you can easily have three wheels within a short amount of time...maybe even less wheels.  They just do not hold up on cobblestone streets.  I've had Samsonite luggage and was quite happy with it until I started to travel to Europe.  They fell apart quickly.  I'm not criticizing Samsonite as I've heard the same concerning other brands using four spinning wheels.  The rough streets tear them apart.  We considered Samsonite on our recent purchase of luggage but went with Briggs&Riley as they have a lifetime guarantee: even if the airline is to blame, they fix it no questions asked.  Even the Briggs-Riley person advised me not to use four wheels for foreign travel with uneven streets.  We got two wheels and they spin just as easily.  This is just a warning that one might want to take into consideration.  FYI.