I have decided that I will never buy a pipe with a vulcanite, ebonite, or cumberland stem again. I've had one too many of my pipes with the aforementioned stem materials start to taste like burning rubber from oxidization after just a few smokes. Even after I do the recommended soak and scrub measures, the taste returns surely. It's just not worth the hassle for me, so from here on if the stem isn't acrylic or horn, I'll pass. I'm not a clencher, so the hardness of the latter materials doesn't bother me. Plus, anything that can help narrow down which pipes I should buy or not is a good thing! I might even look into replacing the vulcanite stems that are still in my inventory, through my local pipe repair guy. Anybody else taken a similar stance?