Giant fans should not get too excited. Porter, known for his pick-six off Peyton Manning in the Super Bowl as a member of the New Orleans Saints, is not a highly-rated player as per Pete Damilatis of Pro Football Focus:
Rotoworld had this to say regarding Porter:
Porter has been getting burned in coverage for years, but NFL teams still seem to see potential in him. He's 27 years old with experience covering the slot and playing outside. He'd enter a camp battle to start with the G-Men.