I've only used one out of 10 so far, but it worked great for transferring .HUS embroidery design files from my MacBook Pro to my Husqvarna Viking Topaz 50. No lag, easy to use, even came formatted for .FAT which is required by my machine (most embroidery machines I think) so all I had to do was plug and play. I was told I would have to buy a new Husqvarna Viking USB stick for $80 (ALL!), but after pulling together and praying, they did it! I hope this helps as there has been some confusion as to whether or not they work with embroidery machines.
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