i stayed 2 months there in 2010, not long enough to be certain about many things but long enough to know the urban transport is excellent, life is much cheaper than here, Antioqueños are very friendly, the city is full of Dieteticas and healthy places to eat and health system is ok. I had "chinches" (bedbugs) in the hostel where and had to go to Clinica Americas where I was helped.
Females are extremely beautiful there, much less complicated than here.
I felt much safer than Cali on streets.
The minus: the connections with the rest of the country, you've to fly every time you want to go to Bogota or suffer a 9 hours trip with the bus.