My wife and son and I returned today from a trip JFK-LIM-EZE-SCL-IPC-SCL-JFK. All flights were in J on LAN.

LAN's long-haul J product is quite good. The food is OK, and the service from the flight attendants is fine...they rarely proactively ask if you want something, but they do respond to requests (e.g., for beverage refills, etc.).

For me the best part of LAN J is the seat.....reclines fully and is comfortable for sleeping.