Anyone had any issues with Belkin covers for ipods and ipads?

I purchased a ipod silicon back cover, with a life time warranty a few years ago for my ipod, and within the first year the black top surface started to wear off. Since then it has lost it's elasticity and often the ipod just slips out, and it is now looking very shabby. As it came with a lifetime warranty, I thought they would just replace it eventually, and it would be a simple process. However when I contacted them, they said that was just wear and tear, and I would need to buy a new one. There is no information about the lifetime warranty in the packaging and exclusions, so I wonder what exactly it is supposed to cover, as there isn't exactly much else that can go wrong with with a silicon sleeve. It has also only had general use, and it has caused scratches on the stainless steel surface, which is ironic since that is the surface it is supposed to protect.
I also purchased a ipad back snap shield for an ipad before xmas. The first one had a crack out of the box, so I returned it. The second was ok for a few days, until I noticed cracks in all 4 corners of it. I did a google search on the problem, and there were many people with the same compliant. So I will be returning it for a refund. But it does make me wonder about the quality of Belkins ipod/ipad protectors. I have however found their electronic stuff to be good.