These guys actually have a working product. Looking on their Reddit page (link at bottom) you can see that people have been using their cards in various countries to successfully buy real-word items. This means bypassing exchanges and banks, allowing us to just spend our cryptocurrencies wherever and whenever we want without delay or prying from the bank.
There are various companies now offering a similar thing, but many require additional steps and have large fees. You can transfer various cryptocurrencies to your TenX wallet, order the card for $15 and start using it with zero transaction fees. Anywhere in the world.
You also get rewarded for purchases with the TenX pay token. This is a token which pays out dividends to holders. I have 10 tokens I bought on Bittrex but I wouldn't expect them to rocket up in value as they have no utility other than proof-of-stake. Think of them more like traditional shares that pay a dividend. The dividends will be paid in Ethereum from merchant-side transaction fees. You have to hold them in a wallet, not an exchange.
I've also downloaded the Android wallet but have yet to put any BTC in, I'd be interested in hearing from people who've actually used it in the comments. I'll be ordering the card within a week and trying it out. I'll report back on how it goes, maybe even video a transaction. Of course I'll only be using it occasionally (not a good idea to spend Bitcoin in general) but it will be nice to have the option.
https://www.reddit.com/r/TenX/
https://play.google.com/store/apps/details?id=com.onebit.app