Food was terrible the first time we went but much better a few weeks later when we went. For a place that specializes in shakes, their chocolate shake is vanilla ice cream with chocolate syrup. Don't expect authentic chocolate ice cream if you order a chocolate shake - theirs tastes just like McDonalds.
The service was awful both visits. It's hard to get a hostess or server because they're all busy eating at the bar. They don't give out silverware and it's hard to get refills on drinks. We had to get our own high chair both times we went and they were sticky and crusted with crumbs. The staff literally watched us, as they sat at the bar, struggle with a baby in our hands to get the high chair and move it to a table.
Food is good but service is bad. Atmosphere is good and nostalgic. If you love chocolate shakes, so sorry, but a trip to McDonald's would get you the same product at a third of the price.
Worth a shot - you could totally disagree with me :)