I think Ian's opinion of the Reising is that its fairly well designed and its reputation is somewhat a little under deserved. As a closed bolt gun it had some merits and qualities in its design that Ian seems to think are under appreciated. He has a resing model 55 video where he really enjoys the compact version a bit. Its weakness was in parts interchangeability and magazines (I've never had one to take apart and swap parts between)
The sten's beauty is that it is both simple and effective therefore it was made by the boat load and issued by the ton where the Resing faded from military use. The Sten is not without its engineering merits, just not as much effort went into the technicalities of the gun's features, rather it was crudly simple, it worked well nothing more and in that way it is superior in my opinion. The reisings I've shot seem to work well and you can hit actually okay with them like a PCC- its evidently not well respected by the militaries of the world who could have taken the design further.
In my view history chose the winner, the Sten, although the Resing's reputation may not be as bad as rumored.
Just my 2 cents.
PS Does John Keene remind you of Dick Cheney in his voice and mannerisms? Actually I enjoyed listening to Dick Cheney as a speaker, I heard rumor he actually liked to shoot MGs