I thought this was a unique idea for Event Planners, especially those who arrange Networking/Mixer events and/or corporate meetings and conferences. Although similar technologies are available on some of our "smart phones" (like The Shake App on iPhone) this is a relatively inexpensive item to hand out in appropriate meetings.
With a simple click of the button, a connection is made with another advice and there you have it...you have traded contact information. It's been stored, ready to be uploaded to your computer. One of the useful features of this product is that you can modify the information you share depending on the occasion or the event that you are attending. You even have the option to edit your info after the event is over with peace of mind knowing that the correct information was shared.
I'm not sure if I would use one myself, but I would do so at a mixer where they were handed out for all to utilize. You can find them here: http://www.minglestick.com/.