I returned yesterday from a LGA-CMH-LGA trip on EMB175 going and EMB170 returning. I paid the princely sum of $219 for my V class return trip. It was my first trip ever on a DL FC equipped RJ, although I have lots of AA and US trips. First, I was promptly upgraded on both legs as soon as the window opened for Diamonds. Second, the new Dl LGA facilities are really very good, the Sky Club (what a nice Diamond perk) is sparkling and well equipped. I neither ate nor drank so cannot comment on those things. Third, we left and returned precisely on time. Fourth, FC on the EMB is my new short-haul favorite. Spacious, comfortable and quiet. Far betterr than the mad dog or 737. I was luckily on the 'A' side. Fifth, courteous, efficient cabim service. Well done Delta!