I ignore LCI as a habit, and if they come out, they don't go back in.
Extractor-indicator or "peek" type are OK, but adding mechanical parts to the most delicate part of the extracting/chambering cycle is just bad engineering.
As not all guns have a LCI and all guns DO let you peek in the chamber to some degree, I just look. Using a LCI to check loaded might be OK with an exceptionally reliable device or a peek style, it just doesn't work on every gun. Using a LCI to check unloaded is NEVER acceptable, however, with any type.