I have a 12 ga Simson sxs, proofed 10/79, which works just fine (now that I had a hammer spring replaced). I bought it NIB in the early 80s and have hunted and shot trap with it since. It's a solid gun, durable, excellent quality. I would not be hesitant about buying another one, for the right price, if I was in the market.
I tried to buy a gun from Blackbern last spring - he had a 16ga Simson listed - and never got any response to my email or my phone call. I figured, if he didn't want to respond, he didn't need my money and I moved on.
And, as to Run's Deutsch ... ehhh. It's raw, wild, uncultured and comprehensible. Just barely....