Lurker,
I understand your position regarding the Pathfinder brand and the basic design issues with all soft sided luggage but, Sundsvall has a valid point.
Most of us have used cheap gym bags and later got one that was significantly better and built out of quality materials. The same appears to be true with soft sided luggage in general. Sure, anything will fail when subjected to enough abuse. The question is how much abuse does it take for failure? Even hard sided luggage with the 50/50 seams have a "design flaw" and will fail at some rate that may be better or worse then soft sided luggage. That is surely not true of the better hard sided luggage.
In my shopping at various retail establishments, I found some soft sided and hard sided luggage that, frankly, I wouldn't put in the belly of an airplane if I had a choice. I also found some at "moderate" pricepoints that showed significantly better quality of construction and as such, should be expected to hold up much better then their cheaper counterparts.
If weight was not an issue, I think we all would carry very solid hard bags you could air drop out of a C130 without a parachute. With weight and size restrictions on commercial flights today, some middle ground must be sought for most of us or flying is just cost prohibitive.
FWIW, I just heard a newsroom tidbit on the TV saying Northwest airlines was limiting bag weight to 50 pounds. Over that and surcharges start to hit you pretty hard. My last experience with British Airways at Heathrow made me a believer. Don't expect leeway or a customer first service policy. Flying, even in business class, is almost an adverseral process in some places. Those of you who have flown intra-Europe probably understand this better then anyone else. American Airlines international was darn good but, those intra-Europe flights rivaled the cattle cars I've been on in the USA with even worse gate service. With this thought in mind, I am shopping for lightweight high quality bags that won't draw the attention of the gate nazi's shaking everyone down so that I can hopefully board the airplane unscathed.