Well, the public transport has improved considerably, since the era of yellow buses, at that time I never used to much, but used the metro. Now I occupy the Tran-Santiago every day to go to university.
The good of tran-santiago: Well, I'm not sure that I have no benchmark against which to compare with, but I like it because transhipments from bus to subway are free, so you spends less. I like that the students have less different price for shipment that is good because has not changed. Besides the new buses are more beautiful, I love that each sector of the city has its own colour I live in Zone G and his colours is blue. Another good point is the fact that it exist special corridors for the public transportation.
The bad points: the are many, but the most important is that the buses are filling up at the times of high demand, and because there are not sufficient quantity of buses, travel times become longer (I hate to wait the bus >.< ) but I think the system to pay with the Bip card is safer than the yellow buses because you don’t need coins to pay.
I think the spite of details this system can improve travel times and the frequency of buses or subway.