Not worth anything!
The camera integration will cause such a lag that you wont even be able to focus your QR code (using an HD logitech webcam) so the first attempt at a scan took me 5 minuites and then it simply got it wrong and didnt take me to my browser at all. I love what these developers are trying to do, bring a QR scanner to the mac, but they need to improve it a lot and should have done so before I waisted $2.99. Dont waist yours. I reccomend after some research and testing, qreader online instead.
waterproofcat about QR Code Scanner, v1.0