Describing the taste of Illy coffee and similar brands
I don't know anything about Illy coffe but you may find these can answer the question I think you are asking. Here is a flavor wheel for coffee: http://www.flickr.com/photos/visualthinkmap/2741624371/ and here is a link and a great website for pretty much everything coffee: http://www.wholelattelove.com/articles/coffee_tasting.cfm. 

Also just to be complete here is a direct quote from the site above, Whole Latte Love, about Illy coffee: 


  "The world’s coffee of choice." 
  Discover the extraordinary pleasure of illy, the celebrated Italian espresso coffee served in the finest restaurants and cafés and enjoyed by coffee connoisseurs worldwide. A blend so popular, it is served in Italy alone over 2 million times a day. Prized for its full, rich body and smooth, balanced flavor, illy's signature blend is meticulously selected and is 100% sustainably grown Arabica coffee. Espresso at it's finest!