My LW 'pretty neat stuff' bag is going on 13 years and the only thing that has been an issue lately is that the main zipper has detached itself from the top and bottom corners. I can still use it, but have to be careful as to how I close it up. When TSA does the 'random check' thing when I have to check the bag, they unravel the zipper a bit more each time.
The long side-pocket zipper blew out after the first couple years. The short and medium on the other side still work. The lower front panel zipper blew out quite a while ago, too. For several years at OH, we had to put our bags in these vinyl duffels and they got tossed around the bag bin on the CRJ. Luckily, mine survived much better than others'. No bowed sides and such.
All's I've done to it over the years is replace a few loose screws with either stainless rivets, or stainless screws. I'm only on my 2nd set of wheels, too. The 'bag man' at DTW at the uniform shop is good at servicing these babies.
I did mod the back of the frame with HDPE (cutting board type material) skids that allow me to drag the bag up curbs, stairs, etc. without scraping the metal frame...glides real nice up the obstructions now!
I'll probably send it in for a rebuild, only because of that darned main zipper problem. Otherwise I'd say it's good for another decade! It'll be in 'light duty' mode now that I'm at G4.