The K&N high flow performance filter (oiled cotton media air filter) lets the engine breathe better, has better filtration and it does not have to be serviced as often.
Also, if you are going to take about 4 hours to remove and replace a LOT of stuff on the bike, just to get at the filter that is deep inside the bike, I strongly suggest that you use the better filter and not have redo the process as often.
Information from K&N's site states the following:
Will NOT Void Vehicle Warranty
Lasts up to 50,000 miles before cleaning is required depending on driving conditions
Economical, a K&N Air Filter Will Last the Life of Your Motorcycle
If you are going to change the filter yourself, make sure to take a lot of digital pics of the steps (helped me to remember where things went). The 4 bolts on each side of the shelter are not all the same for example and knowing how to release all the individual electricial connectors helps (I have the premium sound package and the tweeter connectors were a challenge).
Hope this helps.