I noticed that they were putting a Five Guys burger into the BigY shopping center near the corner of Rt. 1 and Rt 166 last month, but it wasn't til today that I came by around lunch time and decided to check it out. Only new addition to their usual menu I noticed was "hand made" milkshakes (all add-ins free including whipped cream). They open at 11am.
Tried a customized small cheeseburger, small cajun fries and a strawberry shake. As I found with other locations, everything was better than the standard burger chains, but more expensive as well.