Today it's decaf, because I can't seem to keep regular coffee in the house since I got a gaggia classic.
I'm really struggling with anything darker than a medium roast, it seems. I enjoy the sour, fruity espresso from a light roast, but it's not as good for milk drinks. Meanwhile the darker roasts are a little more charcoal than I'd like in an espresso.
The beans are decaffeinated prior to roasting through one of several processes. Wikipedia has a good overview, and of course James Hoffmann has a video.