I like Chappy's - the service is usually pretty good, the food is usually pretty fresh, and the place is usually clean and bright.
Unfortunately, "usually" is the key word - Chappy's is pretty inconsistent. One sandwich will taste totally different from day to day, and may be served by Dr. Jekyll or Mr. Hyde. The restaurant may be sparkling clean or the floors and chairs may be crudded with junk.
While I crave some of the items from Chappy's, I rarely go there - I just got disappointed one too many times with their lackadaisical attitude towards quality service, food, and presentation. I would recommend that you try it and give them a fair chance, since they're a Montgomery institution, and I hope you won't be as disappointed as I've been in the past. When it's good, it's great - but when it's bad, it's horrid.
The one thing that always rocks is the free ice cream. :) Make sure you get some!