I think we're entering in a new fashion era of luggage systems. In the last few years the alluminum cases have been more and more common, but they have some issues, the main one is the "feeling" if going offroad. The problem is that they're (or they become) part of the motorbike frame and so the motorbike is actually more difficult to ride. With the soft cases you don't feel the weight because the bags can move a bit and is a whole new experience. I've been testing Kriega system and they're very good, now I'll test the wolfman top quality saddle bags and I'll let you know. They look marvellous and very well made.
You can buy them from the italian distributor: www.faster96.com