Grand Prix Attack (1. e4 c5 2. Nc3 Nc6 3. f4) is Roman's Favorite opening to meet the Sicilian Defense. Roman will show you a clear plan which will give you a comfortable position, however, if your opponent makes a tactical or positional mistake, he will get crushed or wind up with at least a bad position. Roman has had great success with this opening and is passing his own ideas and concepts on to you. This will increase your wins against the Sicilian.
In the Reti Opening (The Reti white plays 1. Nf3-) Roman will give you easy to learn ideas and concepts on this positional opening. If you play the English, the Reti is a must because on the likelihood of transferring into it. So, if you don't want to remember a lot of theory, and like ambitious hidden attacks, the Reti is for you.