I know a lot of people are big on K&N oil filters. I like their air filters. I don't run with a lot of different motorcycle riders but I do talk to some on the road and read a few forums. In one year I talked to two different people who had their K&N oil filter split. I am not saying K&N is a bad filter but these two personal contacts plus some reports on forums I will not use the K&N oil filter.
I have read research on several of the premium oil filters and it seems Pure One (not their motorcycle filter, it is cheap) may be the best if you can find it in your size.