With my first purchase of a fully handmade pipe (by Tim Thorpe) I discovered the importance of the stem. I'd known the difference, but it never made me truly decide what pipe to smoke. Being a clencher, the stem is vital. Acrylic tends to rattle around too much, especially if it is cold. I like ebonite, and I tend to prefer a thin stem (not narrow) with a thick button to hold it in better. There are very distinct grooves in every stem of mine, where I clearly hold each stem in the exact same spot. I like a taper for better balance, although I have a Morgan Pipes Blackjack where the saddle rests on my bottom lip and holds itself in place better. As stated above, wide is nice, but too wide and it gets awkward. I'd hate to make stems for people, as every one is different, and even I vary what I like depending on the weight and feel of the pipe.