I know I saw a metal entrance excluder/protector somewhere but cannot find it now.

Then will looking I decided why not ask the experts what they think of those round excluders that can be used to completely close off the entrance, have a worker slot and a drone slot (I think that is what the third entrance is).

Are these worth while devices or they something that don't really work well?

And what are the pro and cons of the plastic versus metal ones?

Seems like the plastic would likely get brittle in the sunlight after a few years (depending on type of plastic).

If the metal ones are cheap tin or poor galvanized, they likely will not last long either.

What does the folks here think?