I’ve got a 1965 model. I’ve done it up a bit – I had to as it wasn’t in great condition. I spent a few hundred quid on it, and still not really sure about it! I put in a 2-speed Sachs Duomatic hub – you pedal backwards slightly to alternate between the two gears, and if you backpedal a little harder you activate the back brake. It’s a fun experience at first! I’m a recumbent man these days (yeah, really weird!) but last year I managed a 100k audax on the Moulton. The surprising thing was that even though I was ready to throw it in a ditch, I happened to be the first person back! (I think the faster riders stopped for more cakes…)
Mine might not be typical, but I find the rear suspension good for soaking up bumps, although they never really bothered me on a normal bike. However, I expected the front suspension to completely isolate me from any vibration, which was why I experimented with it, but it doesn’t. I find it quite harsh on a rough or broken road surface.