First of all yes lifetime warranties do matter to me. If something goes wrong with the memory you don't have to mess with the receipt since warranty is lifetime. This is why lifetime is a big deal for me. Whats wierd eventhough their site says this sd card has a 5 year warranty the packaging when i got the SD card says it has a lifetime. I got the card yesterday and it worked fine in my Nikon D50 dSLR.