I have been a happy Eye-Fi X2 Pro user for a couple of years now, in fact I have two of your cards and on the whole they’ve worked well.
Receiving your email about removing support for X2 cards this morning has made me furious. That your company would have the gall to sell cards that would be obsolete within a few years is preposterous. Weasel words about “encryption technologies changing” etc are meaningless, as SSL has not changed fundamentally over this time and all the Wifi protocols are still supported by today’s routers.
I suspect you are cutting costs by not having to maintain older systems to support the older cards, which would be fine if your service was software only. By selling hardware, your company has an obligation to your customers to make sure the cards work without your involvement beyond your support period, or to keep supporting the cards. If you were offering an 80% discount on upgraded cards then I could stomach the transition, but a 20% discount is miserly and clearly designed to grow your bottom line.
I would have updated to the Mobi cards in time anyway, but out of principle I will avoid Eye-Fi products in the future and advise my photographing friends to do the same.
Shame on your company.
Background: Eye-Fi have sent all their customers an email to inform them that all of their cards older than their latest Mobi series will be made obsolete beyond September 16. Services required for the cards to function properly will be turned off by the company, with no support offered. Their X2 cards (amongst the affected) were offered for sale as late as March 2015.