The main thing I used to order when I worked nearby and ordered regularly was the lunch special. A very strictly enforced special, in terms of the times they will sell it to you (I think it ends promptly at either two or three, no bargaining). Anyway, you get jerk chicken, salad and rice. A pretty hearty meal for under five bucks!
This place has the popularity of a fast food joint but I feel like they aren't necessarily running a production line that allows for that sort of service. I know I have gone with my old coworkers in a rush to get back to work only to find the service unbearably so. But mostly that's because the lunch special is pretty popular there, I think.
I have also had the roti there a couple of times and while it's not really close to my favorite roti in town, it's decent and probably better than anything you're going to get to eat in that particular part of town, which is very heavy on fast food chains and light on real satisfying food.