Worked right of the box. No problems at all with this product. Don't know if the merchant service we were using just wasn't compatible with other readers, but this one did the trick.
Overall this product worked very well. Had some issues switching input mode - not a problem with the product per se, but took several browsers before I found one that was compatible with the manufacturers program.
This does not work on Mac. We tried to return it and were told we would be charged a %20 restocking fee and that if we didn't have all the original packaging that we couldn't return it at all.