I am concerned about the comment that they have a shelf life. I just purchased the Janome MBX 4.0 embroidery software for my Janome 11000SE. I was told by my dealer, what ever you do, DO NOT LOOSE THE DONGLE. You are correct, you have to have it to run the software. The dealer told me that if I loose it, it will cost $1200! to replace...basically the same as the entire software package. This would be ridiculous to replace it in three or four years due to a shelf life issue.
D in TX