I flew with them last July/August:
07/28 Santiago-Calama LanExpress A320
08/05 Arica-Santiago LanExpress A320
08/08 Santiago-Punta Arenas LanExpress A320
08/13 Punta Arenas-Puerto Montt Lan Express A320
Service: very professional
Food: great for domestic flights (hot meal + wine)
Entertainment: music + TV
F/A: very cute
(Girls in Chile are cute but in Argentina girls are really gorgeous...).
For me, LanChile is the best airline in South America.