The Tenga Eggs and the 3D strokers will not last too long, the eggs are to thin and the 3D looks like the top will tear at some point. Although my 3D Pile is doing just fine after almost ten months of use.
As far as the Flip Holes and Fleshlights go, none of mine (Two Flip Holes and 10 Fleshlights) has shown any signs of damage so far. My Flip Hole Black gets tons of use and is a year and a half old. What really gets most folks is that I use a toy cleaner on all my Fleshlights and have seen no ill effects.