There is nothing wrong with K&N, but just don't expect a performance increase like in cars. The only benefit it really offers is cleanability / forever use. People that say it actually screws up the bike or loses HP are full of shit.
I like my suzuki OEM filter, glad to see it rated well.
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RIP Jon 08.15.78 - 09.02.03, RIP AJ.
-Ein Verstand, eine Energie. Sie mögen Motorräder und sprechen über sie!
-If it bleeds for more than 3 days and doesn't die, BAN IT!