Very informative video @tuktuk . I ventured on to watch Part 2, and interestingly, in the summary, the guy rates the K & N in second place after bagging it in Part 1 because of the spot welds holding the 'nut' in place fracturing under torque. For me, I'll stick with OEM.
look up purolator (or something like that) shipping would be an issue though. OEM or Hiflow would be my second choice
I hear of Purolator ( http://www.pureoil.com/ ) all the time on the MV Forum. Those guys (mostly USA based) swear by them!
Yes unfortunately cannot get them over here without £10's in shipping + VAT of course I am tempted to to ask friends or family going to the us get some for me.
I can't be sure, but I think so. The 'Pro Honda' might just be an American trade name. I wonder if the learned @Spygoat might add further?