Well... That's it.. I am upgrading to new rMBP by Yosemite release. My 2011 MBP served me well for almost three years and went through RAM upgrade and HDD to SSD replacement. I have to do this upgrade if I want to use Handoff and enjoy the full force of Yosemite.
It will be more useful if I can use it to refill my sons iTunes account using my iPhone camera. Something like this.. I open iTunes on my iPhone then tap a button to input the amount (authenticate using Touch ID) and open the camera to scan the passbook pass to transfer credit.