I have owned one in a past life.
In their day, they were quick, but delicate.
On early ones, with drum front brake, stopping quickly was not an option.
When you braked quickly the forks twisted.. When you put in betterl linings, the drum distorted. No win.
The early bikes were also 4 speed with a very slow gearchange first to second, and a penchant for breaking chains, wrapping them round the front sprocket and damaging crankcases. The electric starter mechanisms fell off the alternators. This in turn did in the main bearing adjacent to it, which in turn cut off the oil supply to the pistons and camshafts.
If parked for a year with a valve full open, the torison bar valve springs had a tendancy to kise their tension, and then the valve would not shut. Electrics were very dodgy, with rectifier failure and corroded connections common when new.
I loved them then, but they are for looking and not for riding.
They were bad, but so was everything else then.
Myke