After abandoning CDE, OLVWM, TWM, WindowMaker, AfterStep, and others back in the day for E16, aside from the eye candy there was nothing ever funky about it at all. It was in many ways like the transition between XP and Win7, a few odds and ends not quite how you like, but all in all a significantly better experience. It has been for me one of the most productive environments I've ever used. Virtual desktops, key mapping, sloppy mouse focus, what's not to like about it? E17 allows you to integrate compiz if that's your thing too.