Buy some. You'll love them. Just be sure to preheat them thoroughly.
Positive Product Points
Incredibly thick cups hold the heat, keeping your shot at it's peak. Brown outter color hides espresso drool, saving you embarassment at dinner parties.
Negative Product Points
Won't hold more than a two ounce double. Not an issue for me. Plain look, if you are into the Illy style or logo cups. Must be careful to warm the cups well, otherwise the thick ceramic will suck the heat from your shot.
I bought these cups from Sweet Maria's. They are super thick, and have a perfect shape to get your nose in the right spot to get the blast of aroma from those fresh roasted beans in your shot. They aren't the most flashy, but for everyday use, they can't be beat.