The TL;DR version: tasty, overpriced food that's not worth the hype.
I came here with my sister when there was just a couple people in line. We had planned on sharing the fries, mushroom burger and a shake, but seeing how small the burger was, we each got our own. The fries didn't seem particularly appealing so we skipped them.
The mushroom burger was like a fun grilled cheese sandwich. The cheese oozed out with the first bite. It was good, but it needed more to it. For $7 and its reputation, I expected a little more "wow." We also got a chocolate malt that was very average. Not bad but not exciting.