Are sandisk memory cards garbage?

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Most of my CF cards are Sandisk. And I got few of the microSD from them as well.

When I bought few of the Sandisk microSD cards recently, I noticed they have Life Time warranty on them. So it makes me feel Sandisk believe their products are reliable enough to offer life time warranty. Well, at least I do not need to worry about it for few years before it become too small.

I should look into that warranty. Thanks.