We had the Speck Fitted cloth-backed cases on out 3G and 3GS and loved them. My wife got the new Speck Fitted for her iPone, which is the same as the Fabshell, but doesn't have the material around the edge like the Fabshell.
If you were a fan of the soft cloth on the old fitted, you may be disappointed in the material on the new Fitted (and I assume the same on the Fabshell.) It isn't woven cloth, but instead a molded textured plastic material to look and sorta feel like cloth; except it doesn't. It feels more like those mini dart boards that you throw a Velcro ball at and the ball sticks to it. A bit disappointed, and glad I got a different case.
On the up side, it should stay cleaner than the actual cloth backing, though.