I sure have! and until last night, I was fairly keen on it....
I've used it before with an oiled type cone filter on for a year, and it was absolutely fine, although last Jan I changed back to a smoothed airbox with a green cotton filter.
I recently decided I fancied a bit more noise, so put the cold air induction kit back on, but this time using an apexi powerfilter, which is like a K&N cone filter, but totally dry in construction with no oil, so it doesn't damage the MAF.
All has been fine for a few months, until last night, driving in torrential rain, I started getting a chronic misfire at high RPMS's, but it was only intermittent, and seemed to be dependant on rain intensity at the time.
You pays your money, you takes your choice! (said in an american gangster accent)