Well..... some very experienced photographers I have read and whom I respect...including Ansel Adams, say not to use filters except for effect. The only tests that matter to me are the ones that I do on my gear to my eyes. I am generally happier with my shots when my filters are off. If others are happier with their filters on, I think they should use them. Thet's the nice thing about this hobby/career it can be very personal and help us to actually enjoy our leisure/work. Advice and opinions are a good source of information to make us think... what works for us after considering that information is up to us.
Dan (Nikon D800,V2,Sony HX400V,Lumix ZS40) "I don't read, I just look at pictures" - Andy Warhol