Solid burger place, with staff generally knowledgable about GF options (and willing to scrape the grill without complaining.) I'm a fan of the hot dogs (sans bun, but with lots of toppings) and my partner loves the burgers with everything on it.
Fries are excellent, so long as they aren't underdone (the bane of thick-cut fries everywhere,) and free peanuts while you wait is also nice.
The State Street location means this place can get busy (and thus VERY noisy,) so if you go at peak times, be aware that it can be difficult to carry on a conversation, even with someone sitting just across the table from you.