Figured I would provide an update for a data point as we just finished our segments on LAN. Overall, LAN lived up to its so-so reputation. I definitely would never go out of my way to fly them, but they are decent.
The gate agents were definitely actively out looking for bags to tag on the flight from LIM to CUZ, so we stayed well clear of the gate until boarding started. CUZ to LIM no one cared at all as the airport was packed. Our flight in business from LIM to EZE also presented no issues whatsoever with carry on baggage.