To be honest I have no idea what is like to ride one those. However after one day at the revival I immediately looked for a pre-1940 bike on the classifieds to experience it myself.
Every two years a lot of pre-war machinery meet on the Autodrome of Linas-Montlhery, just south of Paris and those photos are from the bike race during the 2015 edition (if you are around you should save in your calendar the dates of the next edition the 6/7 of May 2017).
This event remains in my wish-list of events I would love to attend one day. Why? because fighting around the bends a 75 yo machine that sounds like a thunderstorm and smell oil and petrol at half a km of distance is a lot of fun for me.
Dont you agree?