Should you use a paper filter when brewing coffee?

I stumbled across some responses to questions asked of Alan Adler, inventor of both the Aerobie and the Aeropress, at /. a day or two ago. One of these I found particularly interesting - in his words:

I discovered that coffee that's made with metal filters, or maybe we should say coffee that is not made with a paper filter, contains two harmful oils, called cafestol and kahweol. They've been discovered to be the most powerful blood cholesterol raising substances ever found. So the people who drink coffee that's made with a metal filter typically have LDL cholesterol, which is about ten percent higher than people who drink paper filter coffee.

So I decided that even though some people said that they wanted a metal filter AeroPress, I couldn't with a good conscience produce it. However, there are a number of filters on the market from other manufacturers now. I asked the guy who runs The World Aeropress Championships if they were permitting metal filters in Aeropress competitions, which are judged solely on taste, and he said, yes, we allow them, but no metal filter brew has ever won a single heat.

Reading through some of the comments there, there were pointers to papers outlining some of the negative effects of these chemicals. There was also some research suggesting that one of them might also lower cancer risk. Is this just the latest battle between coffee the danger killer and coffee the elixir of immortality?

It's worth noting that if these chemicals are a net-negative that would impact not just brewing with aeropress but pretty much any espresso-based beverages - basically any coffee-containing beverage at your local coffee shop except drip - and stuff like French press or Turkish coffee.

For now I'll stick with my Kaffeologie fine-mesh metal filter. You can decide if I'm crazy or not.