I have an old Platinum II wheeled 30" duffel and roll-aboard. I think they are really well built, though to be honest neither gets a ton of use (duffel is huge; even roll-aboard is too large as it was designed under assumption airlines wouldn't count the wheels and handles in the measurements).
The only time I needed service was when my duffel was broken into on a trip through JoBerg (someone cut off the lock and in doing so also cut the slider. I got it fixed under warranty at a luggage repair shop in NYC quickly and efficiently. I've heard from many their quality has slid over the years, but their old Platnium line was top notch.