I purchased a strontium nitro sthc card it had lifetime warranty it workec fine for more than one year but then I was unable to send videos and pdfs from my pc to this sf card and some time I could do but speed was very slow then after few days I got the error "memory card currupted". Although it has limited lifetime warranty but service centr is not in my city and I would have to go to another place to get replacement.
I have similar sandisk memory card and it is working fine from more than 3 years now.