I pass this place almost everyday on my way to work and I've never dared go in because it didn't look that appetizing, however I got off work really early and decided "what the heck".
First off - it's cash only.
Second - service is fast and friendly.
In terms of the food, the burger was fairly good and the patty taste almost exactly like Harvey's except 25 to 30% bigger (arbitrary number based on "gut" feel - pun intended") but a bit cheaper. I would give the burger 4/5. However, the fries were not crispy and were very bland. For one of the few times in my life, I actually added ketchup to my fries and even then, it wasn't great. 2/5 fries.
So the meal was decent, and really, a large burger, fries and pop for $10 even (tax-in) is a great deal these days. I'd go back.