I have eaten at 25 Burgers a number of times since my first visit. They have a wide variety of burgers available. My personal favorite is the Jersey Burger, with pork roll and cheese. The burgers are cooked to order, and the ingredients on the burgers are fresh. The burgers are also large, so bring a healthy appetite. For health-conscious eaters there are veggie and chicken burger options. The spicy fries are also good. Some of the burgers are a little sloppy, especially the chili and BBQ burgers, but they're worth a few extra napkins.
The atmosphere is 50s diner, with music from the 50s and 60s playing. Booths and tables are available. The atmosphere is decidedly casual. They give you a buzzer to let you know when your order is done, but if it's not crowded you might just get table service.
25 Burgers not only appeals to me, but to my kids (ages 14-21). I have stopped asking them where the want to go to eat when we're in Flemington, because the answer is always the same-25 Burgers.