I too quit using them years ago. The temps can get to 115 here and in Calif. and inside the plane sitting in the hot sun it's a lot warmer. My trims would change quite a bit, nothing that couldn't be corrected in flight though. It's not a big enough deal to bother changing them out though. A lot depends on what part of the country you are living in. I haven't lived in a place with the humidity but I wouldn't think that would effect the rods as much as the heat I fly in??