I have been looking for quite a while for an under-seater bag to take, particularly when flying on regional jets.  Being retired, I don't fly for work, only for vacation purposes.

This bag has the 4 wheels I wanted since I find that navigating an airport is much easier if I can avoid having the "trailing" bag and getting on and off escalators is much easier (also, getting down the airplane aisle is a breeze).  The shape is fairly boxy, which means it maximizes the packing space rather than having rounded corners and losing those edges.  The bag is of high quality and exceptionally nice looking.

With all that being said, the question becomes why did I return it?  Here's what were the downsides for me:

 * The bag is very heavy, even empty.  While not a huge deal if stowing the bag under the seat in front of me, on those occasions where I would be putting it in the overhead compartment, the weight becomes important.

*  The bigger issue for me is how it is organized inside.  It appears designed more for the business traveler and is built with that in mind.  My preference is to have a big, open square that I can customize for my own needs with packing cubes.  In addition to the laptop area (which is just fine), there is another compartment for paperwork (?) and both areas are heavily padded.  The net result is that the remaining space available for packing clothes just isn't enough.  There really is only about half the interior space available for clothing.  While that probably works great for the business traveller on an overnight trip, that just doesn't work for me.

I ended up going with a much cheaper bag ($55) that is much lighter, has a couple of zippered compartments, has a big open space for belongings that I organize with packing cubes.  The quality of the bag I chose is not as good as this one, but is still good and the other suitcase was a better option.