I fly 100,000 miles a year and have seen the worst airline baggage handlers can dish out.  My packed luggage usually weighs between 50-70 lbs per trip so this adds extra stress on the luggage.  I have gone through several soft sided luggage in a year.  I have had TravelPro and Sharper Image as well as numerous "cheap" luggage.  None weathered the airports very well.

I don't like 4 wheeled spinner luggage because the airport usually breaks one of the wheels off after a few trips.  The spinner wheels are very exposed to airport abuse.  All my spinners have a broken wheel.

Baggage handlers also like to lift the luggage when the handle is extended...50% of my luggage ends up with a broken telescopic handle after a couple of months of travel.

After 6 months of usage, I think I finally found my ideal luggage in this Samsonite F'Lite GT.  It looks like it was designed by structural engineers and not fashion designers.  It is not damaged so far.

The telescopic handle is designed to lift a heavily loaded suitcase.  Very sturdy design

The wheels are large (goes over rental car lot rocks and gravel easily), heavily braced and designed for rough, abusive use.

The polypropylene like outer case is very hard to scuff (try scuffing it with a 2x4) yet the airlines have scuffed it up pretty good in a few months.  I think they are using my luggage as jet wheel stops.  However the luggage still seals perfectly and the seams are water resistant.  I would have faith in pitching my suitcase in a pool and expect to still have dry clothes if I scooped it out in a few minutes.

My suitcase has the TSA lock and they work well.  (I get the love notes inside my locked luggage from TSA saying they have been through clothes and possessions.)

The inside has only one divider for your suits and it works great.  I do not have to fold my suit in half to fit in the half shell.

There is no liner which i prefer because it leaves more room for clothes and stuff.  I travel with a plastic bodied Water Pik so I wrap it in an old T-shirt to prevent it from banging around inside the suitcase.  I also traveled with a travel guitar and banjo in padded gig bags with no problems.

This is a plain, very bare bones suitcase but the airlines will ruin any piece of luggage.  This luggage still looks good after being beaten up.  The basic black still looks basic black.

Besides the scuffing, the worst damage so far as been the airlines rubbing off the stickers provided to put your initials on the luggage.  Overall I really like my Samsonite F'Lite.  Kudos to Samsonite for allowing the engineers having the last say in making this luggage.