I just upgraded from 11.2 to 11.3 by using the DVD. I was very impressed by how well it coped with my somewhat hacked system. I had to reinstall the Nvidia proprietary drivers(following the nomodeset instructions), otherwise there was very little else to clean up.
I originally switched to OpenSUSE as a way to smoothly interoperate KDE3 and KDE4. OpenSUSE has proved to be a very safe way to navigate the bleeding edge evolution of desktop kernels, KDE, and other components. I very much appreciate the care and attention to detail in providing something that is so state of the art - thanks to all involved.