Roberto was a really cool guy, his lectures were actually quite interesting and the only reason I lost focus at times was because the class was at 9am on a Monday and lasted for 3 hours. Really enjoyable subject as long as you pay extreme attention in class, because the exam questions was based on really specific stuff he said in class. The subject isn't hard as long as you listen closely in class - otherwise it'll probably be a nightmare. Also the subject didn't have class participation which is always a plus.