I have a strongbag. I've had some issues but nothing I can blame on the bag. I've commuted since day one and show no mercy. I did manage to break a wheel but once again I blame myself for it. However they still sent me free replacements in the mail.
I might try lugging around a LW for a week. I like how their sides aren't hard so you can cram a little more in them. The wheel design on the LW is better. There were some issues with the SB due to faulty fiberglass but they've corrected that by going with composite and frankly you aren't breakin em. As much as I like the soft sides on the LW for room reasons I really dig the solid frame on the SB. I've seen a lot of LW bags rolling around bent and since I'm always swinging mine over and into the back of my truck I know i'd bend it in no time. Considering the price Strongbags are great I just wish their model was about an inch or so wider.