A couple months ago, I changed my oil for the first time. I asked the dealer for a filter for my bike and they sold me this new 'premium' filter. I noticed when changing filters that the new one looked visibly different inside than the old one.
Anyway, I couple weeks later I'm at a different HD dealership and I asked the guy at the parts counter about the filter. He tells me that the 'premium' filter will filter finer particles, but it's harder to draw the oil thru. He said the 'premium' filter is for the Twin Cams, and not the Sportsters.