I've never had any issues with my Ibex.. Shaks, etc. I don't even take them out of my closet.
However, in the past 5 years, I had moths holes in 2-3 J Crew merino sweaters. It's really strange; only that brand. And they stopped making petite sized sweaters, so I am sad.
I put my other wool sweaters in those big plastic storage bins now.