I had a work breakfast at the Gwinnett Diner earlier this year, and I really enjoyed my meal. I got a omelet with toast and hash browns for under five dollars. Entrees ordered by my co-workers looked just as good, and the portion size was huge (I don't think anyone besides me was able to finish their meal -- oink, oink!).
The service was brisk and pleasant. Only minor complaint was that we had the sun shining right in our faces and had to move tables.