Not all Unicentros are at the same level. Some are much larger than others. All are like US malls, except maybe cleaner. There are a lot of shops that look like international brands, but I have never seen outside of Colombia: Americanino, etc. Many clearly are positioning themselves to look like US or global brands. The bigger Unicentros have locations where you can sign up for cellular phone service. The 4 biggest ones I have been to are Cali (near the Intercontinental), Pereira (near the massive road closure and detours for the bike race...), Los Molinos (Medellin, Belen district) and the daddy of them all, Envigado (Medellin, Envigado area). The Envigado Unicentro is pretty new, is right near the Envigado Metro station (short walk) and is connected to VIVA! Envigado. Viva is another chain of shopping centers, always associated with an Exito store. Sometimes the Viva centers are modest in size (e.g., Viva! Laureles). Not so, in the case of Viva! Envigado. It is quite large and, combined with the Unicentro, prepare to go home with sore feet. Every Unicentro I have seen has Bank-associated ATMs, clean, free restrooms and a (pay to play) children's amusement zone. Colombians dress up before leaving the house. If you dress like you're in the US and just running out to the store, you will embarrass yourself. Besides, it shows respect and gets you better service and represents your home country more favorably.