I finally tried this place last night, after having driven by it numerous times without even noticing it.
It was a strange experience, a weird vibe but I can't exactly place why. I counted about 12 employees (and 4 customers, including my DC and me). You can order through a clunky computer system that's confusing (comic sans, no less) and doesn't let you customize, or you can order at the counter and take a number. The space is weird - a sort of industrial, exposed-metal-beam look, and was way too dark. Wouldn't describe it as pleasant.
The service experience was strange for some reason. I think the combination of being over-staffed, under-patronized, and giddiness of ending a work-shift on a Friday night made everyone seem childish - almost rambunctious. Can't blame 'em, I guess. :)
Anyway, back to the chow. They ask you if medium is okay, but your only choice is to move up to 'medium well' or "well done'. They won't cook you anything below a medium. I ordered the Dive Burger, which had lettuce, tomato, "dive sauce" (which was described as - ketchup, mayo, black pep...shit, I don't even remember), and I added pepper jack cheese. Buns did not have sesame seeds, to my relief.
The burger came out in a reasonably timely fashion (they call your number and you pick it up). It's a flat-patty style burger, but the patty was highly irregular, and as expected, way over done. I could not detect "dive sauce", and the pepper jack got lost in a squish of grease. It was a pretty mediocre burger.
Also ordered sweet potato fries, which were actually the best thing we tried. Thin and crisp, and there's a self-serve bar of assorted dipping sauces.
DC got a chili cheese dog, which was just 'OK'. We shared a Peanut Butter Banana milkshake, which was too thin, not PB-y enough. We decided to pitch it halfway, as my homemade Vita-mix protein shakes tasted comparable and are more nutritious.
I don't think I'd be back, even though there were some interesting sounding burger combos (e.g., a sort of Frito pie style, with chili and fritos). Everything was just average.
Now, who knows when Shake Shake hype will simmer down so I can try it without waiting 30 minutes.