I have both the Cleansweep and the Wonder Fence connected to my Dust Cobra. I really do recommend using both options. Each of them on its own is OK, but when you use them both almost all dust and shavings are sucked up by the system. The only time I have dust "escaping" is when I do grooves.
SRSemenza recommended a second extender bar with stop (PPRF-600100), which is a great idea (thanks for that pointer!). I will copy that in my setup. But if you do, remember that those extender bars are made for the normal fence, not the Wonder Fence.
Another thing I have added to the standard setup is a power switch with speed setting. I don't like the idea of large bits (> 1") being forced to their final speed too quickly. The speed dial helps to adjust the startup speed as well as the final speed. It might be just my feeling, but I think it helps reduce the stress on larger bits.