One thing about Vincent’s vs your average old Brit is that many of them have done an awful lot of miles.
Mine had done over 130,000 by the time it was 10 years old, so goodness knows what the total was by the time I got my hands on it as an extremely worn out 50+ year old basket case (the bike that is) !
So, as is the case with any old machine (just more so with a Vincent) they really are only as good as the last person to rebuild them.
On a standard B or C the seat pivots up and down (connected to the swinging arm) and the top yoke, clocks, etc bob up and down with the action of the forks, these factors are definitely ‘strange’ at first and do contribute to a ‘hinge in the middle’ perception, but the perception subsides, and it’s not to the detriment of handling.
A badly built Vin can handle dreadfully, dangerously in fact. Even a well set up Vin will always feel different to other old Brits of the period, but will handle very, very well indeed. Second only to a featherbed of the period IMO.
Tyres were shit in those days, and hydraulic damping was a brand new science. Modern tyre compound, intelligent use of modern damping alternatives and attention to detail on the rebuild will provide a really superbly handling bike.
I can’t comment on the brakes though, I’ve never tried standard brakes.
Mine was so good I used to take it on track days, silly really given how much money and hard work had gone into it, but it was tremendous fun !!
Probably the only bike I actually regret selling.