One shave in...
I opted for the scalloped .68 with the plain cap, using a Super Iridium. The far-too-early points of comparison were better than the Guerrilla but not quite as good as the Blackbird SB.
There's a fair bit of blade feel and a lot of feedback; I agree that the sound is tinny and quite unlike the buttered toast of a vintage Ever Ready.
The non-scalloped head is smooth in use and the dimensions, with the shorter handle, are user-friendly. I reckon the 100mm is too heavy for my tastes.
A fairly close two-pass shave - a reasonable job of my chin and jawline. A touch of burn but no weepers. An interesting fortnight ahead!