A couple of years ago I've been at the main restaurant, while a couple of days ago I've been at the new branch opened close to the Duomo, in the city centre.
The atmosphere is quite different, but the place is anyway cosy enough... perhaps a bit small.
Service is quite fast and helpful.
Food is the classical local Prato food, you shouldn't expect anything very elaborate or surprising (if you're used to local cuisine, obviously). Though, they do their work very well, everything is tasty, and at a very cheap price