The thing that prevents me from using Flip3D is that you have to press alt+tab > tab (tab twice) to start switching windows. Or is that just a bug?
I also don't like the way the desktop has been added to the cycle in both Flip3D and normal alt+tab, because the desktop isn't a window! If I want the desktop I just press start+d.
It's a feature. Myself, I've gotten used to that in Flip 3D. Invoking Flip 3D lets me see everything I have open so I dont have to click through the taskbar and if I want to switch apps or check the status of something I have open, then I can tab through it.
I prefer Start+M myself, it minimizes all windows but leaves Sidebar open.