I have beat the crap out of Wald baskets for years on end, they get pretty ugly after a while, but I don't recall EVER breaking one. I have no clue on the durability of the Linus ones.
Here is my current Wald set up, the back baskets are probably close to 10 years old and have been mounted on several bikes. I also have a Schwinn Signature Classic 3 Cruiser that has Wald saddle baskets on the rear.
Aaron