I can only speak for myself, but I have a 3” Ivory TearDrop on my desk that has been there for a little more than 5 years now, used almost every work day…it has not moved or checked on me at all…it has yellowed a bit…

Anyway the ivory has worked out well for me….even though it’s in an air-conditioned atmosphere…the cold winters and the humid summers do have an affect on things like that…….I have noticed more movement in some woods than the ivory.

As far as outside use, I would think the more extreme the more problems.