Well, they're rubber..so yeah.
My AvP Drone is still in great condition, and it was the first they released.. He does have a few problems though, rubber seperating from the dome, few paint flakes on the belly, etc.
The Aliens Warrior is the one that would fall to pieces weeks after opening. Just google "Hot Toys Aliens Warrior deterioration" or somthing.
What a nightmare..
My Big Chap had some deterioration problems, lost all of it's shine in a few months..wrist pegs snapped right out of the box. Same with my Doggy too.