And my card details are never provided to the merchant with Google Wallet.
Not to mention they are supposed to be connected but if you don't have reception or there is an interruption to cell service you can't pay.
With Google Wallet you need a connection to periodically (15 minutes, 24 hours, infinity) enter the PIN but other than that you don't need a connection to make a purchase. I have my PIN timeout set to 24 hours and I just make sure it's unlocked before I go somewhere where I might use it.
With a connection I get an alert when the transaction goes through (as soon as I get a connection if I don't have one at the time) and a later email verification of the payment.
Except you obviously missed the section labeled "Features" in which it says Autonomous Detection/Tracking/Targeting and Manual/Autonomous Firing with Safety
I'm not seeing that in the article or in the poster. The DODAAM website is slashdotted right now, but if it says that I'd be suspecting a bad translation. There's nothing in the feature set of this piece of hardware that supports automatic tracking or autonomous firing. Detecting a human size target at some distance only means the optics and camera has a certain minimum resolution.
I've actually done some work on integrating a similar US-designed device onto a semi-autonomous vehicle, so I can read the DODAAM poster with some background.
A bug in the hand is better than one as yet undetected.