Firstly I'm giving this only 2 stars because of the seller.  I put the order in on Thursday and paid for expedited shipping.  The other item I ordered came the next day and I was expecting the same from this one, no later than Saturday.  When tracking I saw that it could have been delivered on Saturday however since they marked it for Monday thats when I received it.  I am not to pleased with that.  If I would've known that I may not have payed extra to get it here sooner.  I digress, thus far this product works as expected.  I got it to go with my media player, Cowon J3, in order to get more songs in FLAC format.  The player only recognizes up to 16gb however I have heard a few getting up to 32gb.  I tried my luck with this one and when I received it I formatted it in FAT32, put some of my music on there, and popped it in.  It was able to read it no problems and there has been no lag from what I can tell.  I'm seeing around 7-10 for the transfer rate and I don't think thats bad at all.  Lastly playing videos seems seamless.  I am happy with this purchase and would refer the product to someone else, maybe not the seller.