Espresso beans can be roasted in different ways. Lavazza and Illy represent the best of two different approaches to roasting beans for Italian espresso. Illy roasts their beans for a longer time, but at a lower temperature, than Lavazza. As a result of its higher roasting temperature the Lavazza is darker, and according to some people more robust, than Illy is.
At its best, when properly ground, tamped, and brewed, Lavazza espresso is a bit stronger tasting and also a little bit more bitter than Illy. The Lavazza espresso also has a very pure black color once brewed and when it is done properly it has a hint of licorice in the aftertaste. Personally, though, I prefer the Illy approach which is why I am giving this coffee four rather than five stars. But, even so, I certainly recognize the high quality of Lavazza. In my opinion Lavazza represents the very best of the widely available dark (as opposed to medium like Illy) Italian Espresso roasts.