I'll go first - K&N sucks as an air filter. It passes a lot of air because it has larger pore openings. There are several internet filter comparisons and K&N finishes in the bottom third of most of them. It would work ok as a prefilter because it will keep birds and small dogs out of your engine and the main filter will still filter out the real damaging silt.
Check out the link in my sig for some basic Talon information if you haven't seen it already.