Any type of leg ring/band takes vigilance.
It's pretty easy to check them on the roost at night,
one good reason to have easy access to the roosts.
I have used zipties for my 15(in winter) to 30+(in summer) birds for 4 years.
Never had any real problems, they do break and fall off on occasion,
and a set of end cutters is critical IMO for cutting thru the lock to swap them out as needed.
https://www.backyardchickens.com/articles/leg-banding-with-zipties.68075/
It's pretty easy to check them on the roost at night,
one good reason to have easy access to the roosts.
I have used zipties for my 15(in winter) to 30+(in summer) birds for 4 years.
Never had any real problems, they do break and fall off on occasion,
and a set of end cutters is critical IMO for cutting thru the lock to swap them out as needed.
https://www.backyardchickens.com/articles/leg-banding-with-zipties.68075/