I had a Carlton Circuit, with a similar frame to Spokesmann's Criteriums, and I'd definitely go along with his comments. It wasn't exceptionally light when on the scales, but on the road there was some sort of alchemy taking place that made it possible to forget that there was a bike connecting the contact points at all. If you're built like me with a long upper body, the comparatively long top tube that Carltons were built with is great as well. My weight just seemed to rest in the right place.
Mine had a thirty year old Brooks on it, which just fit perfectly. All in all, a really nice bike, that belies the idea that top end componentry is necessary to enjoy your ride.