I had always been meaning to check this place out, but have been waiting until my son was old enough to appreciate it. Him having turned two last week, and seeing this thread, I thought it was time to go.
First off, the burgers are really great. 1950's style Shoops type patties with high quality buns and toppings. I also had a chocolate milkshake which was served not in a glass, but in the metal mixing cup, and it was fantastic. French fries were food service generic crinkle fries, but it didn't really matter, because after my double cheeseburger and shake, I was pretty damn full.
My wife and son loved it as well. My son loved the atmosphere, oldies songs blasting on the speakers, the model train running round and round the counter, and the staff blowing the train whistle located behind the counter from time to time. Every time the train would run past us and back into the kitchen, my sound would wave and say "goodbye choo choo!"
We all had burgers, so I cannot comment about anything else first hand. The table next to us had the chili which they were raving about. The staff was really nice, and the place was clean. Everyone in there had children, but I wouldn't feel uncomfortable going there without kids and taking one of the tables away from the train circuit.
If this place is really in danger of closing, I urge you to check it out. The burger was really really good for its type, which in itself has become a rarity in the 21st century.
Cheers!