First impressions, having taken it around the big block (it's going for a proper thrash later):
Two minor faults to correct: headset a teensy bit loose and one of the brake cable housings chatters against the stem on rough roads. Not much!
Steering is quite slow - can be ridden no-hands easily enough - but it's a little floppy out of the saddle.
Doesn't feel heavy when accelerating.
The gears are just as slick as they should be.
The brakes are extremely powerful, probably the best braking of any of my bikes.
The tyres are fast so it rolls well enough.
Hill test later. The acid tests are going to be (a) whether the rear axle slips on the chrome dropouts and (b) whether the rear brake rubs in climbs. My other 50s frame has pencil stays and I need to open the rear brake QR, pro-style, before very steep climbs otherwise I can actually feel as well as hear the rear brake dragging - not what you want.