k&n panel filter advice

[hendoau99]

g'day all, im looking at putting a k&n panel filter in my au. a couple of people have said there no good and that a replacement filter from ryco or motorcraft is better. i live down 8 km's of dirt road. im just after your opinion on whether they're worth the money. my dad reckons it isnt because we live down a dirt road and it wouldnt filter aswell and id be forever cleaning my filter and having power and economy issues.