I use the K&N, no issues at all. In fact the Ducati filter used to weep ever so slightly, the K&N hasn't.
2010 696 ProTune Powermap programmer, EvoTech tail, Quat D Alum slip ons, Artrax wavy rotors, K&N, 14T, bar risers, G2 Throttle Tamer. Still working on swapping all of the black plastic over to carbon fiber. Oh, and no more ugly charcoal canister!