I guess the consensus is that if you are lucky and there are no operational issues, and if you buy your tickets early and are able to snatch some of the lower fares, then Andes is an option. The issue is that they have a very limited number of aircraft, so if there is a technical delay you have no other option but to wait. Also, it seems that the other larger carriers do not readily accept Andes tickets, so if you are pressed to make a connection then your only option may be to buy a new ticket from another carrier.