I don't think the person who posted the answer really had a clue and expressed the common misconception that espresso roasts are dark. The fact is that French roast would be about one of the worst roasts to use for espresso. I know; I've tried them myself. You definitely won't be getting any crema out of French roast and altogether it will be a very unsatisfactory outcome and for the beginner at home something that is likely to put them off home espresso brewing completely not knowing that the wrong beans were recommended.
Actually, most of the best espresso roasts are light to mid-roast. What is known as "city roast" is a mid-roast and is the type of roast that is used for the best espresso-based drinks that come from the best coffee shops.
Dark roasts get to the point where the oils of the bean are being forced out through the outer hard shell of the coffee bean because of the extra roasting time and heat. The beans are dark, shiny, and wet looking. If that's how your beans look, then you won't be getting any crema out of them. Use them for filter coffee of French press/plunger coffee. Beans that you use for espresso, even if a darker roast, should look dry without any evidence of the oils having come to the surface of the bean during roasting.
Here are some of my coffee bean recommendations for espresso at home. And if you're really adventurous, then I have a whole series of posts on roasting green coffee beans at home for espresso drinks.
Ed. Note: In early 2011 I found these fantastic beans that are excellent for making espresso coffee, great-tasting and reasonably priced at Amazon. Currently these are the only beans I am using. Give them a try yourself and see if agree: Great Value Coffee Beans Suitable for Espresso.
