One of the downsides I see is that most of the time I share the card, the lead doesn't connect and I end up loosing the contact. I have to end up asking to send me a text message on the spot, but it will be fantastic that as soon as the card is shared (or the QR code is scanned) the card sends a text message along with an email or separately. Text is more convenient than email as people use it more than the other.