Bests & Worsts Reviews from Amazon

Worked for a short time and now it doesn't. Tried to write to an SD card plugged into the unit and it starts to write and after a short time, Windows can no longer see the SD card. I can't even format an SD card without Windows 7 reporting that the SD card is no longer available. Seller requested that I return the item to him, which cost substantially more than the original cost of the product and seller never bothered to ship me the replacement that he promised!