Well, I recently put a bowl of C+D blockade runner through my new MM cob a couple days ago. The cob's rested, but still tastes a little sour- but that might be the taste from the filter. It's the same filter that came in the cob when I got it. When I bought my pipe, I was told that I would need a pack of filters, as the pipe would smoke really hot without them. Indeed, the draft through the unfiltered pipe is quite free, but it seems like this could be remedied by very slow puffing. They also told me that I could use the same filter up to three times in order to save filters. So what do you guys think? Do you use filters, or go without?