I bought my first Norton Commando from them in 1972, No problems.
I bought my latest one from them in Jan 2006, it was a 1972 750 Interstate.
It was a customers bike that they had maintained - they just wanted to get rid of the bike as they just want to deal with new bikes now.
There were a few bodges on the bike when I inspected it closely, hard to say if it was Carl Rosner or the previous owner. The bike looked ok when I bought it but I have spent a lot of money getting it into good condition.
I purchased an 850 from them back in the 80's. It seemed like it was in good shape. After the purchase I realized it was a terrible mistake. It had a bent frame with many other problems. I ended up spending a few grand to fix it.