Update to my original post:

I put the Rottweiler intake on both of our bikes a couple of months ago.  It was a pretty straightforward install.  The kit includes good instructions and there is a video on youtube.

We've done two weeks in the desert of northern Nevada since install.  I used two layers of filter skins on that trip and switched them out every two or three days, next trip I'd leave the bottom layer on for two of three changes of the top layer of cloth.  When I got home and cleaned the main Rottweiler filter, much less material came out of the filter than I expected and zero dust got through into the throttle body and silicone downtube.  I was VERY happy with the performance - plus I really like the sound when you go WOT!

I got the Rottweiler systems due to the leaking OEM airboxes and wanting to use (easily) filterskins.  We have the Safari tank on our bikes which really limits the access to the OEM filter.  If I didn't have the Safari, I'd also think about the UNI filter - prefilter setup from UNI Australia - really nice folks.(google it).  This setup gets you a new lid to the OEM airbox with a foam prefilter that is designed to have a filterskin over the top.  The UNI is cheaper than the Rottweiler, but the Rottweiler leaves you a place for a glovebox under the seat!

RR